Reconnect to a restarted Wayland compositor

Windows now outlive the compositor. On connection loss YASL sends
DISPLAY_LOST instead of closing every window, retries the connection on
a loop timer, rebuilds each toplevel with its title, size, state and GL
context, and sends DISPLAY_RESTORED. CPU windows keep their pixels;
GPU renderers drop Vulkan surfaces and GL objects on loss and rebuild
them on restore.

- Free the dead connection's objects on the next wait, after the
  application has released GPU objects built on them.
- Report a lost connection as an event rather than a failed wait.
- Refuse window and Vulkan surface creation while offline with the new
  YASL_ERROR_DISCONNECTED.
- Close popups, cancel drags and fail pending clipboard requests on loss.
- Print only protocol errors, not ordinary disconnects.
- Examples survive a restart; game.c rebinds its GL context.
- Add an end-to-end test that kills Weston under CPU, GL and Vulkan
  windows and requires them to recover.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/examples/notepad.c b/examples/notepad.c
index 92b9d44..9134653 100644
--- a/examples/notepad.c
+++ b/examples/notepad.c
@@ -1464,10 +1464,6 @@ static void on_event(struct editor *ed, const yasl_event *ev)
         ed->running = false; return;
     case YASL_EVENT_QUIT:
         ed->running = false; return;
-    case YASL_EVENT_DISPLAY_LOST:
-        ed->failed = true;
-        ed->running = false;
-        return;
 
     case YASL_EVENT_WINDOW:
         ed->surface_scale = ev->window.scale;