fix(appearance): rescan schemes and wallpapers on open

Both scans ran once at startup. This shell is autostarted, so that is
once per session: a scheme or a wallpaper added afterwards never
appeared, and restarting the shell was the only way to see it. Six
schemes added during a session were invisible for exactly this reason.

Opening the panel now refreshes both. Verified by adding a palette pair
to a running shell and watching it appear, with its colours resolved,
after the refresh.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G7NRsGyF9jGfPYS4zPqpN7

4 files changed, 22 insertions, 0 deletions

diff --git a/appearance/AppearancePanel.qml b/appearance/AppearancePanel.qml
index 27a0196..708682c 100644
--- a/appearance/AppearancePanel.qml
+++ b/appearance/AppearancePanel.qml
@@ -31,6 +31,10 @@ Scope {
     function show(which) {
         if (which) root.tab = which;
         root.notice = "";
+        // Schemes and wallpapers can both have changed since this shell
+        // started, which for an autostarted one is the whole session.
+        Udt.refresh();
+        Wallpapers.refresh();
         root.open = true;
     }
     function close() { root.open = false; }
diff --git a/appearance/README.md b/appearance/README.md
index f0e9a09..aba231a 100644
--- a/appearance/README.md
+++ b/appearance/README.md
@@ -62,6 +62,9 @@ are.
 
 The list comes from the palette directory rather than a hardcoded set, so
 adding a scheme to unified-desktop-theme is enough to make it appear here.
+Both the scheme list and the wallpaper scan are redone every time the panel
+opens: this shell is autostarted and runs all session, so a scan done only at
+startup would go stale the first time anything was added.
 
 Applying writes the `scheme =` line in `~/.config/udt/roles.conf` and runs
 `install.sh`, which regenerates every themed config. **It reloads nothing**,
diff --git a/appearance/Udt.qml b/appearance/Udt.qml
index 30ae285..81e6427 100644
--- a/appearance/Udt.qml
+++ b/appearance/Udt.qml
@@ -71,6 +71,14 @@ Singleton {
     // The scheme list comes from the palette directory rather than the comment
     // in roles.conf: adding a scheme is adding two files, and this then needs
     // no edit at all.
+    // Rescanned whenever the panel opens: adding a scheme is adding two
+    // files, and a shell that has been running since before they appeared
+    // would otherwise keep showing the old list.
+    function refresh() {
+        listProc.running = false;
+        listProc.running = true;
+    }
+
     Process {
         id: listProc
         running: true
diff --git a/appearance/Wallpapers.qml b/appearance/Wallpapers.qml
index 0d61f90..0317ea5 100644
--- a/appearance/Wallpapers.qml
+++ b/appearance/Wallpapers.qml
@@ -55,7 +55,14 @@ Singleton {
 
     // Sorted by most recent first: the wallpaper wanted now is usually one
     // added recently. -maxdepth keeps a stray git checkout from being walked.
+    function refresh() {
+        scanning = true;
+        scanProc.running = false;
+        scanProc.running = true;
+    }
+
     Process {
+        id: scanProc
         running: true
         command: ["sh", "-c",
             `find ${JSON.stringify(root.dir)} -maxdepth 2 -type f ` +