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| -rw-r--r-- | CLAUDE.md | 46 |
1 files changed, 42 insertions, 4 deletions
@@ -42,7 +42,8 @@ UI thread Worker thread MainWindow NotmuchWorker ├ query row: QComboBox, QLineEdit, └ owns the only notmuch_database_t* │ saved-query QPushButtons - ├ QTableView ── ThreadListModel (SubjectDelegate) + ├ ThreadListView ── ThreadListModel + │ (RowStyleDelegate every column, SubjectDelegate on Subject) └ MessageView (header QLabel, QWebEngineView, attachment bar, TagStrip) Config (INI) KeyMap MailSync (QProcess) MimeParser (GMime) @@ -53,9 +54,21 @@ The query row and the message-pane header are **built inline in `MainWindow` and `MessageView`**, not as named widget classes. Earlier revisions of this diagram listed `QueryBar`, `SavedQueryBar`, `HeaderWidget` and `AttachmentBar`; none of those types have ever existed, and looking for them wastes a search. The widget -classes that do exist are `MessageView`, `TagStrip`, `TagDialog` and -`SubjectDelegate`; `TagChip` is a namespace of painting helpers, not a widget, -and `ThreadCidMap` is a struct. +classes that do exist are `MessageView`, `ThreadListView`, `TagStrip`, +`TagDialog`, `RowStyleDelegate` and `SubjectDelegate`; `TagChip` is a namespace +of painting helpers, not a widget, and `ThreadCidMap` is a struct. + +**`ThreadListView` exists because a delegate cannot paint outside its column.** +The tag chips under each row are one strip spanning the whole width, so they +are drawn in the view's `paintEvent` after the cells. Consequences that are +easy to undo by accident: `SubjectDelegate` reads `AccountLabelRole`, which +belongs to the ROW, so installing it view-wide draws the account chip into +every column (a `Q_ASSERT` catches this); row height must be set on the +vertical header, since a table takes one height per row and a column's +`sizeHint` only applies if the view happens to ask that column; and because +alternating colours, the selection and the model's `BackgroundRole` are all +painted per cell, the view has to fill the strip's band itself, honouring all +three or a deleted row is cut in half and every other row shows a bare stripe. **No `notmuch_*` pointer ever crosses the thread boundary.** Data crosses as the plain value structs in `src/types.h` (`ThreadSummary`, `MessageRef`, `TagChange`), over queued @@ -157,6 +170,31 @@ it. Verify against a real keyboard before changing a default on reachability gro separate, real trap `normalizeSequence()` handles is a **bare capital** (`N` parses to unshifted Key_N, which no keystroke emits). +**Rendering probes lie in specific, repeatable ways.** A whole session was spent chasing +a defect that did not exist because of these; each was believed until it was contradicted. + +- **Counting lit pixels cannot tell bold from regular.** Antialiasing lights a similar + number either way, so an "ink count" reads identical whichever is true, in both + directions. It measures nothing. **Text width** distinguishes weights (277px against + 306px for one string at 12pt), and a **strict pixel diff** distinguishes renders. +- **`viewport()->render()` returns a blank image** in several ordinary situations: before + the widget is exposed, when the content sits outside a viewport narrower than the + columns, and sometimes with no discernible cause. A probe that reports "no ink anywhere" + is far more likely broken than the code it is testing. Check that it finds the thing it + expects to find *before* trusting it to report the thing it expects to miss. +- **A "saturated pixel" threshold catches antialiased edges of the selection highlight**, + hundreds of distinct near-background colours, and will pass whatever the code does. Match + the exact colours the model supplies instead. Two versions of one test passed under + mutation before this was noticed. +- Every rendering test needs a **mutation check** and a guard proving it *can* fail: assert + the geometry it depends on (a column is on screen, a row has non-zero height) rather than + assuming it. + +The bug that started all this was not in the code at all: the desktop's Qt font was +configured **Bold** in qt6ct, so every row rendered bold and `setBold(true)` changed +nothing. Before concluding a Qt facility is broken, check the desktop's own font and theme +configuration. + ## Web view security The most security-sensitive area: a browser engine pointed at input from strangers. Do not |