Protect live state during restore and reset

tests/quickshell/settings-backup-live-contract.sh

@@ -43,6 +43,8 @@ for mapping in \
     'HomePreferences.initialize(ids);' \
     'HomePreferences.setAlias(id, alias);' \
     'DesktopPreferences.reload();' \
+    'DesktopPreferences.set("displays", value);' \
+    'Displays.externalChangeBlocked = blocked;' \
     'SystemSettings.applyPersistedDisplayPolicy();' \
     'Keybinds.applyReload();' \
     'Wallpaper.set(path);' \
@@ -82,9 +84,11 @@ jq -e '
         "home.alias:light.desk=Desk",
         "home.alias:light.office=Office",
         "desktop.reload",
+        "display.protect:{\"DP-2\":{\"mode\":\"4500x3000@60\",\"scale\":1.5,\"transform\":0}}",
         "system.apply",
         "keybinds.reload",
         "wallpaper.set:/tmp/restored-wallpaper.jpg",
+        "display.block:false",
         "shell.reload"
     ]
     and .initialized == true
@@ -118,15 +122,26 @@ jq -e '
     .calls == [
         "home.reset",
         "desktop.reload",
+        "display.protect:{\"DP-2\":{\"mode\":\"4500x3000@60\",\"scale\":1.5,\"transform\":0}}",
         "system.apply",
         "keybinds.reload",
         "wallpaper.set:/tmp/restored-wallpaper.jpg",
+        "display.block:false",
         "shell.reload"
     ]
     and .initialized == false
     and .favorites == []
 ' <<<"$status" >/dev/null || fail "absent Home handoff was wrong: $status"
 
+# Restore refuses before launching the helper while a display apply/recovery is
+# active, so no snapshot can race the confirmation boundary.
+qs_test ipc call settings-backup-behavior reset >/dev/null
+[[ "$(qs_test ipc call settings-backup-behavior restoreWhileDisplayBusy)" == "false" ]] \
+    || fail 'snapshot restore started during an active display operation'
+status="$(qs_test ipc call settings-backup-behavior status)"
+jq -e '.calls == [] and (.lastError | contains("display change"))' <<<"$status" >/dev/null \
+    || fail "display-busy restore refusal was not clean: $status"
+
 trap - EXIT
 cleanup
 printf 'settings backup live contract: PASS\n'