YouTube Chat layer: one-per-layout gate + legacy label heal (TASK 27)

2026-08-24 09:08:03 -07:00
parent ef710c5537
commit 708b336da7
6 changed files with 169 additions and 27 deletions
@@ -318,6 +318,11 @@ This replaces the old five-seeder cluster (`Seed{Starting,Brb,Ending,Chat}Backgr
  TASK 26; the old per-staged-scene gate let a second picker run from a scene that lacked the config).
  **Removing the last webcam config anywhere clears the identity** (`_webcam = null`, raising
  `CanAddWebcam`/`CanChangeWebcam`), which also drops "Change Webcam…" and re-enables Add.
+  The **YouTube Chat layer follows the same one-per-layout rule** (TASK 27):
+  `CanAddYouTubeChat` greys out the (+) item while any scene carries a ChatBox source (raised on
+  staging + elements change; `AddSource` refuses a second as defense in depth). Chat layers created
+  before the "YouTube Chat" default still carried the legacy name "Chat" (commit `65641d8` era) —
+  LoadLayout heals exactly that un-renamed default to "YouTube Chat"; creator renames are untouched.
 - **Round→rect restores the aspect (persisted, schema v4):** `SceneElement.ToggleClipShape()`
  snapshots the rectangular Width/Height into public `RectWidth`/`RectHeight` before going Round and
  restores them when switching back — otherwise the Round resize lock (square) would leave a square