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2026-08-08feat(worker): load a thread as a reply tree with per-message depthDanilo M.1-0/+2
loadThread could not be extended to do this. It walks notmuch_query_search_messages, and a message obtained that way returns NULL from notmuch_message_get_replies (notmuch.h:1617-1628), so that walk cannot produce reply depth at all. The tree comes from notmuch_thread_get_toplevel_messages instead, and the pane keeps the flat list it wants. walkReplies takes raw notmuch_message_t*, against this file's rule that every handle is RAII-owned. Messages reached through a thread are freed with it (notmuch.h:1637), so an NmMessage wrapper would destroy memory the thread frees again. The NmThread in the caller is what keeps them alive. Every message in the thread gets a node regardless of the query: the list is where the reply count is read, and hiding unmatched replies would make that count disagree with the rows under it. Both tests mutation-checked. Flattening depth fails the depth assertion, and skipping the thread walk fails it too, so neither passes against the two mistakes the notmuch API invites.
2026-08-07feat(sync): sync only the accounts with unsynced editsDanilo M.1-3/+59
A sync ran mbsync -a regardless of what changed, so tagging mail in one account fetched all of them. The account set was not a parameter anywhere on the path: MailSync::start() took no arguments and the script hardcoded -a, so nothing between a tag edit and mbsync carried which account changed. Track which accounts have edits and pass their mbsync channels through to the script, which now takes channel names and falls back to -a when given none. An empty set means all accounts, per the request: a sync with nothing pending is a fetch, and narrowing that to wherever the last edit landed would quietly stop collecting mail everywhere else. The channel is a new optional per-account key rather than the section key. The two names genuinely diverge, because a QSettings section key may carry dots that the channel does not, and mbsync treats an unknown channel as fatal rather than skipping it, so key-as-channel would fail those accounts' syncs outright rather than degrade. It defaults to the key, so accounts whose two names already agree need no config change. The edited-account set is deliberately not netted the way the pending-edit map is: that map tracks the index, where a tag removed and re-added leaves nothing outstanding, while this tracks the mail store, where both writes have already renamed files that mbsync still has to propagate. It is also snapshotted before flushHeldEdits(), which inserts into it synchronously rather than on a queued reply, so a successful sync cannot clear accounts whose edits it never carried. Closes item 49. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-07feat(ui): add a Maildir overview under HelpDanilo M.1-0/+93
Nothing in the UI reported database-level facts: every query gave a thread count for that query, and nothing said how much mail there is overall. A dialog under Help now shows messages, threads and tags from notmuch, plus the account list from config, since notmuch does not model accounts at all. A separate worker call rather than a reuse of requestCounts, which counts threads to match the row count of a query. This counts messages, which is what a user means by "how much mail is in here". The test pins 4 messages in 3 threads against the fixture and fails if they are ever made equal, so routing both through one count cannot pass unnoticed. Every field starts at -1 and renders as "unknown" when notmuch could not answer it. Printing 0 would say the Maildir is empty, and telling someone their mail is gone is the worst way to report an index that failed to open. The dialog opens showing "Counting..." rather than blocking, since counting every message is not free on a large database. That makes two lifetimes matter: the reply can arrive after the dialog is closed, so the label is a QPointer, and the dialog can be closed and reopened while a count runs, so a generation counter drops the older answer. The test drains DeferredDelete before firing the late reply, because close() deletes through deleteLater and without that the dangling case is never actually reached.
2026-08-07feat(ui): make Escape deselect the row as well as blank the paneDanilo M.1-0/+33
Blanking the pane while leaving the row highlighted reads as half an action, and deselecting is what Escape means nearly everywhere else. The user asked for two actions rather than a changed one, so clear_pane keeps its behaviour and moves to Shift+Esc; clear_selection takes Escape and does both. Shift+Esc rather than unbound because every action carries a default and a test enforces it. Clearing the selection re-adopts the thread it just cleared, unless done in exactly the right way. clearSelection() leaves currentIndex() valid, so onSelectionChanged takes its "one or fewer rows" branch, sees a current row whose id differs from m_currentThreadId, and calls onThreadSelected for it. Clearing the selection before blanking lets that run while the id still matches, so nothing reloads, and clearing current stops a later collapse-to-one-row reaching the same row. All four arrangements were tried; only this one passes. The first version of the test could not distinguish any of them. It asserted showingPlaceholder(), which passes regardless because this fixture has no worker, so loadThread never replies and the pane is never repainted. currentThreadId() and currentIndex() are observable without one, and asserting those is what made the test discriminate.
2026-08-07feat(ui): fill the blank message pane with a branded placeholderDanilo M.1-0/+101
An empty right pane said nothing, and multi-select made it a routine sight. It now carries the wordmark, thread counts that run their query when clicked, and a sync line that appears only when something needs attention. Rendered into the existing web view as a third document shape, so there is one document path and one set of security rules. The brand palette is a deliberate exception to deriving colours from the desktop theme, since a logo is brand rather than chrome; the theme still picks which of the two sets is used. Counts refresh when the pane is about to show rather than in the background: one goes stale the moment a tag is edited, and refreshing one nobody is looking at is work for nothing. A generation counter discards a superseded reply, and a late answer cannot repaint over an opened thread. The helper lines are real links because JavaScript is off in this profile. The handler is gated on the placeholder actually being displayed, so the same URL inside a message body is dropped: a stranger's mail must not drive the thread list, even to run a harmless query. Three defects found while building, all silent: - Every CSS percentage was invalid. QString::arg does not collapse "%%" into "%", so the document carried "50%%" and the browser dropped each declaration holding one, disabling the mask, the glow and both radial gradients while still rendering something plausible. Substitution is by named token now, which cannot collide with a percent sign. - A geometry probe endorsed the layout while that was live, because it measured only properties without percentages. - The font test passed against a build with one face missing, since the other satisfied both of its checks on its own. The mockup's light values needed correcting against a real pane: the grid vanished at a 2% luminance step on white, and the glow subtracts light there rather than adding it, washing the pane. Strength only, not hue.
2026-08-07feat(ui): show each thread's tags under its rowDanilo M.1-9/+30
The thread list was uniform and cramped: every row one line tall, with nothing to say what a thread was about before opening it. Rows are now roughly double height, carrying a strip of tag chips beneath the text, with alternating row colours and a star column for flagged threads beside the existing paperclip. The strip is painted by the VIEW rather than by a delegate, which is why ThreadListView exists. A delegate is handed one cell's rectangle and cannot paint outside its column, so a strip drawn from the subject column stops at that column's edge, losing the last tags of a well-tagged thread, and starts at its left edge, putting the chips under the subject instead of under the row. Tags the row already shows another way are left out: inbox as structure, unread as the dimming, flagged as the star, attachment as the paperclip, and the account as the chip in the subject cell. Sorted, since notmuch's order is not guaranteed stable and a row whose chips reordered between repaints would flicker. Six defects were introduced and fixed on the way here, all of them one consequence: a QTableView paints per cell, and a row-wide strip is not a cell. SubjectDelegate installed view-wide drew the account chip into every column, since AccountLabelRole belongs to the row; it is split into RowStyleDelegate for every column and SubjectDelegate for the subject alone, with a Q_ASSERT guarding that. Row height returned from sizeHint did nothing, because a table takes one height per row. The strip painted from x=0 over the marker columns, via a protected viewportMargins() that returns 0. Measuring the text band and the strip with one font put the pills over the date. Alternating colours and the selection are per-cell too, so the band showed bare viewport background until the view filled it, honouring the model's own BackgroundRole first so a deleted row is not cut in half. And that fill spanned the full width, cutting the centred marker glyphs at their midpoint. Closes item 5. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-07fix(ui): tell read threads from unread without relying on boldDanilo M.1-3/+8
Bold was unread's only cue, and it renders identically to regular on the user's system: confirmed by eye against a bare QTableView holding a plain QStandardItemModel, with no code from this project involved. The fault is in Qt or fontconfig, below this application, and nothing in the model could ever have reached it. Read and unread mail looked exactly alike. The emphasis is inverted instead. Unread rows keep the palette's own text colour and read rows are dimmed toward the background, so the cue rides on Qt::ForegroundRole, which the delegate already honours, and costs no column. It also suits the real ratio, measured at 99 unread against 4220 read: dimming the bulk is calmer than highlighting it. The dim colour is derived from the palette, never hardcoded, per the rule item 12 established. Bold is kept for systems where it works, but nothing depends on it now. That exposed a second defect, visible the moment it shipped. Qt resolves ForegroundRole into the palette and then prefers it over HighlightedText, so a model-supplied colour wins on a SELECTED row too. The dim is blended against the unselected background, so a selected read row painted grey on the selection colour, near unreadable. SubjectDelegate::initStyleOption now reverses that, and the delegate is installed view-wide rather than on the subject column alone, so every column gets the same handling instead of three of them keeping Qt's ordering. The guarding tests state the property rather than the mechanism: strip the font from the model's answer and the two states must still differ. A test asserting only that bold is set passes on a system where bold paints like regular, which is exactly how this survived. The selection test renders two rows identical but for the unread tag, selects both, and requires zero differing pixels. Part of item 5; the density work and the star column remain. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-07feat(tags): mark every thread in the view read, in one undoable stepDanilo M.1-0/+74
An action removing "unread" from every thread in the current view, on the toolbar, the Message menu and Ctrl+Shift+U. It deliberately ignores the selection, which makes it the one action in the window that does, and it routes through the same funnel as every other tag change, so it is one write rather than one per thread. Disabled until the query reports its total. Threads arrive in batches, so before then the model holds only what has landed, and an action saying "all" must not silently skip the rest. A greyed control says "not yet" without needing a dialog or a stall the user cannot see. The state is also set at registration, since QAction starts enabled and a window that has not run a query has nothing to act on. Two things came out differently from the plan, both forced by existing code. It carries a default binding, because everyActionHasAShortcut requires every registered action to have one: an unbound action is unreachable from the keyboard, and that invariant is deliberate, so the action was given Ctrl+Shift+U rather than the invariant relaxed. And only the threads that are actually unread are sent, because sending the rest would inflate the pending-edit count with writes that change nothing, and the quit prompt reads that count. A view with nothing unread does nothing, pushes no command and says so: an undo entry that restores nothing is worse than none, since it absorbs a Ctrl+Z meant for the previous action. undoDepthForTesting() is new and exists for a reason worth recording: undo->isEnabled() cannot answer "was a command pushed", because the undo QAction is always enabled and tests canUndo() when triggered. The first version of the no-op test asserted on it and passed against a mutant with the unread filter removed. Closes item 43. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-07feat(sync): the status bar says which account is syncingDanilo M.1-4/+48
"Syncing..." was set once and never updated, so a run that takes over a minute reported nothing about what it was doing. The original diagnosis in the backlog was half wrong, and two further wrong ones were made and discarded before the real cause: plain "mbsync -a" prints NOTHING until it exits, then a single summary line. Measured on a real run, one line at 11:11:08 then 73 within the second 11:11:33, at the end of a 46-second run. So there was no stream to read for the part of a sync that takes time. It is not buffering, so stdbuf changes nothing, and the account name is not unavailable either, which was the second wrong conclusion. mbsync -V is what changes both: it announces each channel as it reaches it, which is at once the progress and the account name originally asked for. The shipped script now passes it. SyncPhaseTracker derives a short status from the output as it streams: the channel being synced, the summary counts when mbsync ends, then the notmuch reindex. It lives beside MailSync rather than in the window so the matching rules are one testable thing, and it holds no widget. Matching is loose and case-insensitive, since the wording varies by version, and nothing in it decides success or failure: the exit status remains the only authority on that. Lines are reassembled in MainWindow before being fed, because QProcess::readAll() splits wherever it happens to and a half-line would match nothing. Every status is sanitised and truncated: the channel name comes from a config file this app does not own, and a long one must not stretch the status bar. Two defects in existing code, fixed with it. setSyncBusy(true) ran after start(), so a fast run's output arrived before the per-run reset and wiped its own phase. And a first draft deferred phases while a transient message showed, which let a "Background sync completed" message armed before the sync began suppress the whole run: a running sync's state outranks an expiring event message. Verified by replaying real captured mbsync -V output through the tracker, not only against fixtures. The MainWindow test paces its script with sleeps, since a script that prints everything at once arrives in one readyRead and makes every intermediate phase unobservable. Closes item 42. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-06fix(ui): one Sync control, and a query bar that looks finishedDanilo M.1-29/+56
Sync had two controls that behaved differently. The QPushButton beside the query bar cleared the log, opened the pane and disabled itself; the QAction behind the toolbar, menu and shortcut called start() and did nothing else, discarding its return value so a rejected start was silent. Worse, item 29's "disable Sync during a background sync" set the button only, so the toolbar entry stayed clickable through a cron sync and could only produce the script's EX_TEMPFAIL skip. startSync() is now the single handler behind every route in, and the enabled state lives on the QAction, which reaches the toolbar, the menu and the shortcut at once. It also reports when no sync command is configured rather than doing nothing. The QPushButton is gone. It read as a Search button given it sat beside a text field, which is the user's own observation and the reason the toolbar one survives instead. Its unavailable-command tooltip moved to the action, since that is the only thing that says why the control is dead. Removing it left the query field running flush to the window edge, so the saved-query buttons move from their own row onto the query row. The bar is now framed by the account dropdown on the left and the saved queries on the right, the empty row is gone, and the thread list gains the space. The field also gains setClearButtonEnabled, which is Qt's own themed clear icon rather than a hand-rolled button. A "Search" button was considered and rejected: Return already runs the query. No overflow handling for [queries], which is unbounded. Three entries fit; item 23 already specifies buttons-plus-menu and is where that belongs. CLAUDE.md's architecture diagram named four widget classes that have never existed, QueryBar, SavedQueryBar, HeaderWidget and AttachmentBar. The query row and the message header are built inline. Corrected, and the components that do exist but were missing from it added. Tests: the new action test was verified red first and load-bearing by mutation. The old button test is deleted rather than repointed, being an exact duplicate of it, and the unobservable-lock test now drives the action. The clear button and the row layout were confirmed by hand; no test clicks the icon, which is a mouse path. Backlog: 45 done and reclassified as a defect rather than a cosmetic redundancy, 47 added for the bar.
2026-08-06test: stop two tests depending on the machine they run onDanilo M.1-1/+16
Both are the same class of defect: a test that reads real machine state and so passes or fails on circumstance rather than on the code under test. Item 38. Every MainWindow a test builds constructed its SyncMonitor on the live /proc/locks, so a window observed the machine's actual sync state and the sync-button assertion failed whenever the user's cron sync happened to be running. Cron fires every ten minutes and a run lasts ~35s, which is roughly 6% of runs, and it read as flakiness. SyncMonitor already took an injectable locks path for exactly this; MainWindow did not expose it. It does now, as a test seam rather than a config key: /proc/locks is not something a user would set, and a wrong value silently disables background sync detection instead of failing loudly. The monitor is still constructed and started, per the item's own constraint. Only the table it reads is redirected, to an empty file in the test's own temporary directory. Item 46. uiStateSurvivesARestart asserted a 940px width, and the offscreen platform reports an 800x800 screen. restoreGeometry() clamps to the available area, so the width came back as 798 while the 620 height, which fits, restored untouched. That asymmetry was the tell that persistence was fine and the test was wrong. The size is now 640x560 and carries no meaning beyond differing from the default. Verified by reproducing the original conditions rather than by waiting for them: the suite run under flock -n /tmp/mbsync.lock fails item 38's assertion with the seam bypassed and passes with it in place, and item 46 now passes under offscreen where it failed. One dud mutation is recorded in the backlog, writing an unparseable line into the injected lock table does not fail the test, because lockHeldIn() correctly finds no lock in it. Suite: 15/15 offscreen with the lock held, and green on Wayland except the pre-existing querycompleter screenshot flake, which fails to grab under Wayland and passes offscreen.
2026-08-06fix(sync): hold tag edits made during a background syncDanilo M.1-2/+130
A tag edit sent while another process holds notmuch's write lock does not fail: the read-write open blocks and then succeeds. Measured against Slackware's notmuch, 9.158s against a 12s hold, status SUCCESS. Since the worker is a single thread, that blocked open holds up every read queued behind it, so the message pane freezes on whichever thread was selected first and replays the queue when the lock releases. The window now defers instead. While SyncMonitor reports a sync running, a tag change is held rather than sent, and flushed when the sync ends. The optimistic update stands in the meantime, so the row keeps its tag and the edit still counts toward the unsynced indicator, which is what the quit prompt reads. The original diagnosis was that the open fails and the edit is discarded, and a retry was built on it. That was wrong: the error branch in notmuchworker.cpp is unreachable through lock contention. The premise was taken from a plausible-looking error path without provoking the condition, and measurement disproved it. The backlog entry records this rather than quietly correcting it. Verified by hand against a real blocking open, which the tests cannot reach: they drive the deferral through the meta-object and never take a lock. Both locks held for 100s with a tag edit made during the hold. Row kept the tag, status did not expire, indicator rose, window stayed responsive, held edit sent itself on release. The 2s SyncMonitor polling window is knowingly left open: a sync starting between polls is invisible for up to 2s and an edit there still blocks. SyncMonitor::lockHeldIn() would close it at the cost of one file read per tag action, and is recorded as the option to revisit. Also fixes revertPendingTagChange() clearing the entire undo stack after any rejected write, found while working on this. Backlog: item 37 done, and item 46 added for a test that fails only under the offscreen platform, where an 800x800 screen clamps a restored 940px window. Pre-existing and unrelated; the suite is green otherwise.
2026-08-04fix(sync): count unsynced edits as net state, not as writesDanilo M.1-8/+56
Item 28, reported by the user: open a thread, let the automatic mark-read remove `unread`, then press Ctrl+U to put it back. The indicator read "2 unsynced change(s)" with the mail store exactly where it started. The counter incremented per confirmed write and never decremented, so any add-then-remove of the same tag inflated it. Mark-read is simply the path that fires without being asked, which is why it surfaced there. The user's call was net state: an edit and its inverse are zero outstanding changes, because what the indicator answers is whether quitting now would strand work. A QHash keyed "<messageId>\n<tag>" replaces the int, and a pair that reverts is erased rather than stored with the new direction, so the map cannot grow without bound across a long session of tagging and untagging. Keyed per (message, tag) rather than per message: removing `unread` and adding `flagged` on one message are independent changes and must not cancel each other. A change carrying no message ids cannot be netted against anything and is counted separately, since dropping it would understate the indicator, which is the direction that costs work. Both properties item 18 established still hold: a successful sync clears everything, a failed one clears nothing. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(ui): make Delete a toggle, and expire transient status messagesDanilo M.1-11/+69
Items 16 and 33. Delete now removes the `deleted` tag when every selected thread already carries it, so pressing it twice puts a thread back. One direction for the whole selection, never per row: toggling each independently would leave a single keystroke with the selection in two states, which is worse than either outcome. Status messages are classified rather than blanket-timed, which is the substance of item 33. Events expire after six seconds and fall back to the last query's thread count: "Sync complete", "Nothing to undo", the skip notice, the per-action "Archive: 3 threads". State does not expire: "Searching...", "Syncing...", the selection count, and "Sync failed (exit N)", because an error must not vanish before it is read. A test caught a mistake in that routing. Making the per-action message transient armed the timer during select-all, since tagSelected() runs on a selection onSelectionChanged() had just described, and the count would then be replaced while it was still true. Writing the count now cancels any transient still counting down. QStatusBar::showMessage() would give the same behaviour but the label is added with addWidget() beside permanent widgets, so adopting it means reworking that arrangement. One timer beside the label is the smaller change. Both fixes verified by reverting them and watching the tests fail. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04fix(ui): name the default button on the quit promptDanilo M.1-0/+9
Item 31. The user could not tell which button Enter would press on the unsynced-changes dialog. The code was already correct: setDefaultButton() is called, and Qt agrees, isDefault() and hasFocus() are both true on "Sync and quit". The active style, qt6ct-style, simply draws no visible default-button decoration. The GIMP dialog offered for comparison is GTK drawing its own focus ring, a different toolkit. Naming the default in the text rather than restyling the button: overriding the appearance means fighting the user's theme, which is worse than one word. The safe option was already the default, so no behaviour changed. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(ui): disable Sync during a background sync, and blank the pane on EscDanilo M.1-7/+49
Items 29 and 32. 29 was a constraint item 27 specified and that shipped unbuilt: while a cron sync held the lock the Sync button stayed clickable, and pressing it could only produce the EX_TEMPFAIL skip. The progress bar and the button are now written by one updateSyncControls() taking both sync sources, which the item asked for by name: two independent assignments, one per path, means whichever finishes second wins, so a background sync ending would re-enable the button in the middle of a local run. Unknown re-enables the button, deliberately. It means /proc/locks could not be read and nothing was observed, so leaving the button disabled would strand it permanently wherever the lock cannot be seen. 32 adds a clear_pane action on Esc. It clears m_currentThreadId with the pane, not merely alongside it, or a threadLoaded still in flight would paint the thread straight back; and it cancels any pending mark-read, since a thread blanked from view must not be marked read two seconds later. The selection, the query and the undo stack are untouched. The one real risk in 32 was Escape being stolen from the query completer, the way Return was once lost to a window shortcut. Probed rather than reasoned about: a popup consumes the key before a window-level shortcut sees it, so the completer still dismisses. Every test here was verified by reverting the code it covers. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04fix(sync): stop a local sync reporting itself as a background oneDanilo M.1-8/+26
Reported from hand testing: a manual sync ended with "Sync finished elsewhere" stamped over its own result. Ownership of a lock period was being decided when the lock was RELEASED, by asking MailSync::isRunning(). That question cannot be answered then: the process exits, so isRunning() goes false, and only afterwards does the next poll observe the lock gone. The guard therefore suppressed the message while the sync ran and let it through at the end, up to two seconds after onSyncFinished() had already said what happened. Ownership is now latched when the lock APPEARS, which is the moment isRunning() can still answer, and the matching release is swallowed. onSyncFinished() hands the latch back when it sees exit 75, because a skip means the lock was never ours: if a manual run and the cron run start inside one poll interval, the lock would otherwise be latched as local and that other run's completion swallowed with it. Also renames the messages to "Background sync running/completed" per the user: "finished elsewhere" reads as though the application does not know what is syncing the Maildir, when in fact it is the same script. The tests added here cover the external path and the Unknown state. They do NOT reproduce the reported bug, and were checked against a reverted fix to confirm that: staging it needs isRunning() true at the Running transition and false at the Idle one, which cannot be arranged in test_mainwindow without a configured sync command and a live child process. That was tried and abandoned, it left a process running for the length of the suite and popped a dialog. The ordering and the fix were instead verified against a standalone model of both code paths. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(sync): notice syncs this window did not startDanilo M.1-0/+41
The user's cron runs mailsync.sh every ten minutes, so mail arrives and tags change while the window sits idle, and nothing here noticed. The script already holds an flock for the whole run, so that lock is the signal: no status file is needed, and a kernel lock cannot go stale because it dies with the process holding it. The observation method is the part that matters, and two of the three plausible ones are wrong. Both were probed on Linux 6.18 before any of this was written: - flock -n acquires in order to test, so polling every two seconds would open a window every two seconds in which a starting mailsync.sh is refused the lock and exits 75. It would cause the very skips the script reports. - fcntl(F_OFD_GETLK) never acquires and looks ideal, but reports UNLOCKED against a lock held by flock(2): separate lock namespaces in the kernel, which cannot see each other. A silent false negative. - /proc/locks is a pure read. It observes flock(2) correctly, and since it takes no lock at all it can never contend with the Xapian write lock notmuch new holds during the same run. Confirmed: 200 reads left the lock table unchanged and this process holding nothing. SyncMonitor keeps the parsing separate from the polling so the parsing is testable, and it reports Unknown rather than Idle where /proc/locks cannot be read: "no sync is running" is the claim that would let the window quit, so it must never be guessed. Verified against a real flock end to end, not only against synthetic content. It reports rather than refreshes. runCurrentQuery() clears the undo stack, the selection and the message pane, which is right for a query the user typed and hostile for one a cron timer fired: it would discard undo history and close the thread being read up to six times an hour, with no action from the user. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(ui): make multi-select discoverable and stop it opening threadsDanilo M.1-0/+147
Multi-select already worked by Ctrl+click and Shift+click, but nothing in the UI said so and every tag action was keyboard-only, so the Ctrl+T tag dialog could not be reached with a mouse at all. Adds a select_all action on Ctrl+A, registered like every other action so it reaches the Edit menu, the shortcut reference and [keys]; a right-click menu on the thread list built from the same QActions rather than parallel copies; a selection count in the status bar, which is the part that actually teaches the feature by acknowledging a selection while it is being built; and a note in the shortcut dialog for the mouse gestures, which are view behaviour and cannot appear in the generated table. A selection gesture must not open mail or mutate it. Selecting several rows now blanks the message pane and cancels any pending mark-read, rather than rendering each row swept through and queueing it to be marked read. Two Qt behaviours shaped this, both established by probe rather than from memory: - selectAll() emits no currentRowChanged at all and leaves the current index invalid. - currentRowChanged is emitted BEFORE the selection model is updated. The second one caused two distinct faults. Collapsing a multi-row selection back to one row reported the old count, so the guard swallowed the load and the pane stayed blank; that case is handled in onSelectionChanged, which sees the true count. And a Ctrl+click taking the selection from one row to two also reported one, so the thread was loaded, blanked, and then painted back when the queued reply returned from the worker. By the third row the id was already cleared and the reply was discarded, which is why the fault presented as an off-by-one in the threshold rather than as a race. Tests cover the synchronous half. The late-reply guard has no test: MainWindow in tests has no worker, so threadLoaded never fires and the repaint cannot be reproduced in process. Verified by hand instead. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(sync): dismissable log pane, progress bar, and a skip that is not a failureDanilo M.1-6/+87
Four changes to the sync UI, three of them from using it. The log pane could not be dismissed. It is hidden at construction and shown on failure, and nothing ever hid it again, so a single failed sync left it on screen until the application restarted. It now sits in a container with its own Close button, and is 200px rather than 120, because mbsync's output is wide and repetitive and the shorter pane showed too little of it to read. It still appears only on failure, which the user confirmed is what they want. A sync gives no feedback while it runs. The status bar now carries an indeterminate progress bar for the duration, and the Sync button is disabled rather than left looking live. The bar is indeterminate on purpose: mbsync reports no percentage and the script's output is unstructured, so a bar filling left to right would be inventing a fraction nobody knows. The log is also cleared at the start of each run, since leaving the previous run's lines in place makes a stale failure look like the current one. The lock skip was reported as a failure. mailsync.sh exits when another run holds the lock, and that was exit 1, which qtmaildir reads as "sync failed": it showed the log pane and, on the exit path, told the user their changes were still unsynced. With a cron timer every ten minutes, a click landing inside a run is routine and none of that is true. The script now exits 75 (EX_TEMPFAIL) and the window reports it as its own case, saying a sync is already running. On the exit path it stays open and says plainly that the other run is most likely carrying the changes over but that this window cannot see it finish, rather than guessing either way. That last hedge is what item 27 records: the application cannot see a sync it did not start. The user chose continuous polling of the lock file over the narrower "only while quitting" version, and the entry notes that the lock is already the signal, so no status file is needed, and that a kernel lock cannot go stale where a written file can. Verified against stub binaries: a second run while the lock is held exits 75 and says SKIPPED, while the run holding it completes at 0. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(tags): add an Edit tags dialog on Ctrl+TDanilo M.1-0/+41
Five hardcoded tags were the only ones reachable from the UI: archive, delete, spam, flag and toggle_unread. For an application whose purpose is organising mail by tag, applying any other one meant leaving for a terminal. Item 26 of the usability backlog, raised by the user asking how to add a tag and finding they could not. One dialog rather than separate add and remove actions, at the user's choice: filing something under a new tag while dropping inbox is one thought, not two. Type tags to add or remove, comma separated, or clear a checkbox to drop a tag already on the selection without retyping its name. Both fields complete against the tag list MainWindow already holds for the query completer. Completion is a guard against typing shoppping beside shopping, never a whitelist: inventing a tag is the entire point, so any valid name goes through whether or not it exists yet. Tri-state checkboxes carry the multi-thread case, and are where the risk is. A tag on some selected threads shows partially checked, and leaving it alone changes nothing; the opposite reading would silently tag threads the user never looked at. A tag already on every thread and left checked is likewise not a change and is not sent as one. Tag names are validated before anything is applied, through a free function so the rules are testable on their own. Empty, a leading dash (notmuch's CLI reads it as removal, making such a tag a trap), whitespace and control characters are refused by name and reason. Nothing is applied until the whole set passes, since the user cannot tell which half of a partial change landed. TagDialog is pure UI: handed the vocabulary and the current state, returning two lists, contacting no worker. That is what lets its fifteen tests run without a notmuch database. Integration is a single call to the existing tagSelected(), so undo, the optimistic model update, the combined multi-row query and the completer refresh for a brand-new tag all come for free. One test assumption was wrong and the code was right: a case asserted that QStringLiteral("null\0byte") truncates at the null and reads as empty. It does not, so the null is caught as a control character. The test was corrected rather than the validator. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(sync): show unsynced edits and offer to sync on exitDanilo M.1-18/+153
Tagging changes the notmuch index at once, but the mail store only hears about it on the next sync, and nothing said so. Quitting with tagging outstanding was silent. Items 18 and 19 of the usability backlog, built together because the second needs the first's counter. The counter cannot be QUndoStack::isClean(), which is the obvious candidate and the wrong one: the undo stack is cleared on every query, since its entries refer to rows the new result set discards. Tag a thread, run any query, and the stack is empty while the change is still unsynced. m_pendingEdits is its own count, incremented where a write is CONFIRMED rather than where one is sent, so an optimistic update the worker later rejects cannot leave the indicator claiming an edit that never landed. Only a successful sync resets it: clearing on failure would assert the changes had reached the mail store when the sync is exactly what failed to put them there. It is shown in the status bar, hidden entirely at zero, and described as a lower bound rather than a guarantee, since an external notmuch run can carry changes over without this application noticing. On exit, sync_on_exit in [general] takes ask, always or never. Three values rather than a bool because "prompt me", "just do it" and "do nothing" are three behaviours and true/false expresses two; an unknown value warns by name, since a typo there silently changes what happens to unsynced work. The prompt offers three buttons for the same reason: a user who hit Quit by mistake needs a way back that is not "sync". A sync started at exit holds the window open until it finishes rather than being killed mid-run, and a sync that FAILS does not quit, because quitting there would discard the user's choice silently. With no sync command configured the prompt degrades to a plain warning instead of offering a sync that cannot run. This is not a destructive-action confirmation of the kind CLAUDE.md forbids. Those cover tag mutations, which keep undo instead of a dialog. This asks about losing work at the one point where undo cannot help. The tagsApplied lambda became a named slot, which is better structure and also what lets a test drive it: the worker is deliberately parentless because it moves to its own thread, so reaching it with findChild to emit the real signal cannot work, and contorting the test to try was the wrong instinct. Testing a modal needed its own care. A test that sends a close event hangs forever if an unexpected dialog opens, because the modal spins its own event loop; CloseProbe polls for activeModalWidget, closes it and records that one appeared, turning "a dialog opened" into an assertion rather than a hang. Also removes a stray qDebug left in the open_thread action by the earlier Enter-key investigation, which had reached two commits. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(threads): mark an opened thread read after a delayDanilo M.1-0/+85
Opening a thread left it tagged unread, so the unread count never matched what had actually been read and the app was quietly wrong every day it was used. Item 6 of the usability backlog. A single-shot timer, armed when a thread is selected and restarted rather than stacked, so arrowing down a list marks only the thread still selected when it fires and not every one passed through. Configurable through mark_read_delay_ms in [general], defaulting to 2000: zero marks read at once, and any negative value disables the behaviour, which is why the value is neither clamped nor warned about at either end. The automatic change deliberately does NOT go on the undo stack. It routes through sendThreadTagChange() rather than tagSelected(), because undoing an action the user never took is worse than leaving a thread read, and toggle_unread already gives them a direct way back. It still funnels through the single applyTags path; what differs is only whether the inverse is pushed, which is a window-level decision above the worker. An explicit toggle_unread cancels any pending timer, or marking a thread unread by hand would be reversed a moment later and the key would look broken. Two guards beyond the plan, both from asking what happens when a timer outlives the thread it was armed for. Arming is skipped for a thread that is not unread, so no write is scheduled that would change nothing, and the handler re-checks that its thread is still selected and still unread before writing, so a stale timer does nothing rather than tagging the wrong thread. The plan expected the rapid-arrow case to need a database and a manual check. It needs neither: ThreadListModel takes threads through appendBatch(), so the case is unit-tested. All three tests were confirmed to fail against deliberately broken versions, one arming for read threads and one creating a timer per selection instead of restarting one. Item 7 is closed in the same pass. The user verified against real mail that HTML messages already open as HTML, which is what the item asked for, so it is recorded as done with no code changed. The prefer_html key it floated was not added: nobody has asked to default to plain text, and Ctrl+H already switches a thread by hand. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(message): show From/To/Cc and add a details dialogDanilo M.1-0/+6
MimeParser has filled To and Cc all along and HtmlBuilder simply never interpolated them, so both were parsed on every message and then discarded. The header strip showed the subject and a message count and nothing else, which is item 2 of the usability backlog. The header now adapts to what it can say honestly. A thread holding one message shows From, To and Cc under the subject, where every field is unambiguous. A thread holding several keeps showing the subject and the count alone: the recipient differs message to message, and once the user has replied there is no single address the thread is addressed to, so naming one would be a guess presented as a fact. Per-message detail is what the dialog is for. That dialog lists Subject, From, To, Cc, Date and Message-Id for every message, numbered when there is more than one, in a read-only plain-text widget. Plain text is the security decision, not a stylistic one: these values come from strangers and the dialog exists to show them verbatim, so the format that cannot interpret markup is the right one. The header label is RichText and every value interpolated into it is escaped, since an unescaped From injects into the application's own chrome rather than into the sandboxed page. Reached by a Details... button beside the subject and by Ctrl+Shift+D. Both, because a shortcut alone restates the complaint this backlog opened with. The binding is shifted because Ctrl+D is delete, and the destructive action keeps the key it already had rather than being moved to make room. An empty Cc omits its row instead of printing a label with nothing after it. Both header shapes were rendered to PNG and inspected, not only asserted. The new button also exposed a latent flaw in an older test: attachmentButtonLabels() identified attachment buttons by excluding the one other button's label, so it counted the details button as an attachment as soon as one existed. It now finds the bar by object name and reads only its children. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04fix(query): let the query bar keep Return instead of open_threadDanilo M.1-5/+50
Pressing Return in the query bar moved focus to the thread list and left the query unrun, so a query typed at the keyboard could not be executed at all. Return is bound to open_thread as a Qt::WindowShortcut, and a shortcut is dispatched before the focused widget ever sees the key. Qt withholds a plain-LETTER shortcut from an editable widget, which is why every other binding in the map was safe here, but Return is not a letter and gets no such protection: the action fired from inside the bar, its handler called setFocus() on the thread list, and QLineEdit::returnPressed was never emitted. Accept the ShortcutOverride for Return and Enter on the query bar, which tells Qt the focused widget wants the key as ordinary input and stops the shortcut being dispatched. Narrow by design, one widget and one key, so open_thread keeps working everywhere else in the window. Three earlier hypotheses were tested and disproven before this one, and two synthetic probes wrongly reported the binding as harmless: real input sends ShortcutOverride first and only dispatches the shortcut if nothing claims it, while QTest::keyClick skips that round trip entirely. The new test drives the override exchange rather than the keystroke and fails against the old code. The comment claiming no filter was needed said the letter rule covered this case; it did not, and it now says so. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat(completion): wire query completion into the main windowDanilo M.1-1/+49
Adds the complete_query action, whose registration the assertion in registerActions() has been demanding since keymap gained the name: a known action nothing implements would have been a silently dead binding. Also lands the QueryCompleter half of the manual trigger, which the keymap commit left behind: triggerCompletion() and the focus-in filter gated on completion_on_focus. Tags refresh at startup, after a sync, and after a mutation introduces a tag not already known, since that is the tag most likely to be typed again. onAllTagsReady deliberately drops the generation the signal carries: a tag list is not an ordered query result, so a later one is always at least as good as an earlier one and discarding on staleness could only throw away a good list.
2026-08-04feat(about): custom About dialog with icon, copyright and project linkDanilo M.1-7/+46
Replace QMessageBox::about with a QDialog laid out in two columns: the application icon on the left at 40%, the version, description, copyright and AI-assistance notice on the right at 60%. A full-width row below both carries the project URL. The copyright line, GPLv2 notice and AI-assistance disclosure were absent from the About window despite being present in the source headers and the README.
2026-08-04feat: show a paperclip for threads with attachmentsDanilo M.1-1/+18
An attachment was only discoverable by opening the thread. A narrow leftmost column now marks the threads that carry one. No new worker query is involved: notmuch applies the "attachment" tag while indexing, so ThreadSummary already holds what this needs. The marker is a glyph rather than an icon resource, which ships no new asset and inherits the row font, so it strikes through with a doomed thread like every other cell. It falls back to "*" where the system font cannot draw U+1F4CE, since an unrenderable codepoint reads as breakage rather than as a marker. Two silent Qt behaviours had to be handled, both found by probe: QHeaderView::restoreState() returns true for a blob saved against fewer columns and applies the old widths shifted one place right. Adding a column in front would therefore have mangled every existing saved layout with no error to detect it by. The column count is now stored beside the blob and a mismatch discards it, so the widths reset once on upgrade instead of landing on the wrong columns. QHeaderView's default minimumSectionSize is 58px on this platform, and setColumnWidth() clamps to it without reporting the smaller value back, so the column could not be narrow at all until it was lowered. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat: choose the startup query by nameDanilo M.1-2/+6
The app opened whichever saved query sorted first alphabetically, which is not a choice anyone made: [queries] is read through childKeys(), so savedQueries().first() means "Flagged" before "Inbox" before "Unread" rather than anything the user expressed. [general] startup_query names the entry to open and defaults to Unread, so a fresh install comes up on the unified unread list. Saved-query button order is untouched and stays alphabetical. A name matching no saved query falls back to the first one rather than starting with an empty view. That is reported as a problem only when the user actually wrote the name; the built-in default naming a query they never created is not something they got wrong, and warning about it would fire on every launch of a config that has no Unread entry. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat: own the message-pane zoom and persist itDanilo M.1-0/+38
Zoom was Chromium's, not the application's: the web view handled the keys natively and never told anyone, so there was no value to save. qtmaildir now owns it. Zoom in, out and reset are real actions, in the View menu and rebindable through [keys], and the factor is persisted to the UI state file. Ctrl+wheel over the body zooms and Ctrl+middle-click resets, both filtered by ancestry from an application-level filter: the events are delivered to an internal QQuickWidget the web view creates lazily, so a filter on the view itself never sees them. The factor is clamped to 0.5 - 3.0, and NaN, infinity, zero and negative values fall back to 1.0, since a corrupt state file must not be able to leave the pane unreadable with no visible way back. Both risks the plan flagged turned out not to exist, verified by probe rather than assumed. The application QAction wins over the web view's native zoom key, so the tracked factor cannot diverge from what is on screen. And the factor survives setHtml(), so the web view is the single source of truth and needs no reapply per render. A third finding is worth recording because it produced a wrong fix first. A probe using QTest::keyClick() reported Ctrl++ as a dead binding, and a test was written asserting that. Both were wrong: Ctrl++ is exactly what the '+' key emits on an Italian layout, confirmed against the real keyboard, and it is the shipped default. Whether a symbol needs Shift is a property of the layout, not of Qt, and keyClick() reproduces neither. The test now only checks that every default parses, and the comment in defaultBindings() says not to re-derive this from synthetic input. Ctrl+= is a second binding for reset, skipped when [keys] gives it to something else. Also fixes a pre-existing bug the new config key exposed. [general] entries were read as "general/<key>", which matches nothing: QSettings' INI backend treats a section literally named [general] as its own fallback section and strips the prefix. notmuch_config had therefore never worked. Both keys are now read without it; the file format is unchanged. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat: persist window, splitter and column widthsDanilo M.1-5/+71
Resizing the window, the splitter or a thread-list column was undone by the next launch. State now round-trips through a separate settings file at ~/.local/state/qtmaildir/uistate.conf, written on close and read at startup. The state file is deliberately not the user's config: a base64 geometry blob does not belong in a hand-edited file, and rewriting that file on exit would drop its comments and key order, which QSettings does not preserve. Two details that are easy to get wrong: QStandardPaths::StateLocation appends both the organization and the application name, and both are "qtmaildir" here, so it resolves to ~/.local/state/qtmaildir/qtmaildir. The path is built from GenericStateLocation instead, matching Config::defaultPath(). Restore runs after buildMenus() rather than at the end of buildUi(): QMainWindow::restoreState() matches toolbars by object name and silently drops the position of one that does not exist yet. Every restore is conditional on a non-empty blob, so a missing or rejected state file leaves the built-in defaults instead of producing a zero-size window. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat: let an account set its chip colour and labelDanilo M.1-2/+48
Two optional keys in an [account.<key>] stanza. color fills the chip, label sets its text. Both belong to the account rather than to [tagcolors] because an account tag is a different taxonomy: which mailbox a thread arrived in, not what state it is in. label is display only. "account-provider-work" is a lot of row for one bit of information, but the notmuch tag is never renamed, so existing queries and external tagging are unaffected. Unset falls back to the account key, and an empty label is ignored rather than rendering a blank chip.
2026-08-04feat: make every thread list column resizableDanilo M.1-7/+10
Subject was Stretch, which computes its own width and discards a drag, so it alone could not be resized. Every column is Interactive now. Nothing absorbs spare width as a consequence, so the view scrolls horizontally instead of squeezing columns when their total exceeds the viewport. Per-pixel, so scrolling does not jump a column at a time.
2026-08-04fix: let the thread list columns be resized againDanilo M.1-4/+9
Tags, Date and From were set to ResizeToContents while fixing the pushed-off-screen Tags column. That mode computes the width itself and discards a drag, so the columns stopped being resizable. Verified: with ResizeToContents a request for 250px yields 150, with Stretch 478, with Interactive 250. The reorder alone already fixed the original bug, since Subject stretches and is last, so nothing can be pushed past it. Locking the other three was unnecessary and also blocked the saved-column-widths item, which needs widths a user can actually set. They are Interactive again, with starting widths a drag overrides.
2026-08-04feat: show that a tag action landedDanilo M.1-0/+8
Selecting a thread and hitting Delete changed nothing on screen, so there was no way to tell the action had stuck. The tag was always applied: applyTagChange() emitted dataChanged across the row, and the Tags column did update. But Subject was set to stretch while Tags came after it, so Subject took all free width and pushed Tags out of view. The feedback lived in the one column that could not be seen. Columns are now Tags, Date, From, Subject, with Subject stretching last so nothing can be pushed off the right edge. A thread tagged deleted or spam fills its whole row, muted red or orange with white struck-through text, through the background, foreground and font roles, so no cue depends on one column remaining visible. Strike-through accompanies the fill on purpose: it survives a theme that overrides backgrounds and reads without colour. Bold for unread still composes with it. Archive adds no tag, so an archived row is left unstyled for now.
2026-08-04fix: keep the shortcut reference inside the screenDanilo M.1-12/+45
Fourteen actions in one table made a dialog taller than the display, which pushed its own title bar off the top. The rows are split into two columns of seven, with the closing note spanning both. QMessageBox is replaced by a plain QDialog. The message box wraps its text at a narrow fixed width, which broke every description into a column of single words and was most of the height: 719x1084 before, 1426x366 after.
2026-08-04feat: add menus, a toolbar and a shortcut referenceDanilo M.1-81/+179
Actions were a QHash of std::function dispatched by an event filter, which nothing could put in a menu. They are QActions now, bound from KeyMap so a [keys] override reaches the menus as well as the keyboard. Menu bar covers every action; the toolbar carries only Sync, Archive, Delete and Undo. Help > Keyboard shortcuts is generated from the actions, so it shows what the keys really do rather than a copy that drifts. spam and load_remote gained defaults, having been unreachable without a hand-written binding. The event filter is gone. Probing showed QAction shortcuts are dispatched before the focused widget sees the key, so they beat QAbstractItemView's type-to-search without one, and Qt already suppresses plain-letter shortcuts while an editable widget has focus. Dropping the filter's blanket guard also lets Ctrl+Q work while the query bar has focus. registeredActionNames() is derived from the actions rather than hand-maintained, so the two drift tests it needed are replaced by checks that a configured binding reaches its action. No confirmation dialogs: tag mutations still answer to undo.
2026-08-04Add GPLv2-only license and per-file headersDanilo M.1-1/+20
Confirmed with the maintainer as v2-only rather than v2-or-later. LICENSE is the official text from gnu.org. Every file under src/ and tests/ carries the matching notice. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04fix: let key bindings win over the thread list's type-to-searchDanilo M.1-0/+9
With the thread list focused, 'h' jumped to the next thread whose subject began with "h" instead of toggling HTML, and j, k, a, d, N, F, u and G were swallowed the same way. The keymap only worked when focus happened to be somewhere else. installEventFilter(this) was on the MainWindow, and a window-level filter only sees key presses the focused child did not consume. QAbstractItemView consumes plain letters for its type-to-search feature, so it took them first. The filter is now installed on the thread view as well, which puts the keymap ahead of that search. The existing query-bar guard in eventFilter() still keeps ordinary typing working there. Found by the maintainer while walking task 13 item 14, and confirmed fixed on screen. No regression test: a QTest::keyClick attempt passed both with and without the fix, because synthetic key posting does not reproduce the focus and consumption path that causes the bug. A test that cannot fail is worse than none, so it was dropped rather than kept for appearances. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04fix: only interrupt startup for real configuration problemsDanilo M.1-4/+14
Found while walking the task 13 checklist against real mail. Item 1 ("startup shows no configuration warnings with a valid config") failed: with a perfectly valid config that simply had no [sync] command, every launch opened a blocking modal that had to be dismissed before the window could be used. Config now separates the two cases. A problem is something configured but wrong (a sync command that does not exist, an account with no maildir); those still open a dialog, as does every KeyMap warning, since each one means a binding the user wrote is being ignored. A notice is an optional feature simply not being configured; it reports to the status bar only. Nothing is broken in that case, and a modal on every launch teaches the user to dismiss dialogs unread, which defeats the ones that matter. problems() is a subset of warnings(), so callers wanting everything need only the latter. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-04feat: add MainWindow wiring query, list, message, and syncDanilo M.1-0/+495
Wires the worker thread, thread list, message pane, sync process and undo stack together, and replaces the placeholder main() with real startup: custom URL schemes registered before QApplication, a libnotmuch ABI check, and config loading. Four fixes against the drafted version: - onWorkerError() only set a status label. Its own comment elsewhere claimed it reverted the optimistic update, and the spec requires that; it did not, so a rejected write left the list showing a tag the database never received. The pending change is now recorded and rolled back, and a confirmed tagsApplied clears it so a later unrelated error cannot undo a write that succeeded. - runCurrentQuery() cleared the model but left the undo stack pointing at rows that no longer exist. Undoing after a new query would have written to the database while the visible list stayed put. The stack is cleared with the model. - m_currentMessages was assigned on every thread load and never read. Removed. - buildUi() connected sync output to m_syncLog and errors to m_statusLabel before either existed. Both are constructed before the wiring now. cidPrefix generation lives here, this being its only producer in the application, and is pinned by tests: it must never contain '!' and must be distinct per message, which are the invariants the cid: namespacing rests on. A second test holds registeredActionNames() against KeyMap::knownActions(), since those two hand-maintained lists drifting either way silently breaks a user's key binding. Mutation-verified that dropping an action fails the test by name. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>