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, 1 insertions, 1 deletions

diff --git a/src/platform/wayland/pointer.c b/src/platform/wayland/pointer.c
index 5f486ae..0cd8c5b 100644
--- a/src/platform/wayland/pointer.c
+++ b/src/platform/wayland/pointer.c
@@ -542,7 +542,7 @@ static const struct zwp_locked_pointer_v1_listener locked_pointer_listener = {
 static void surface_lock_pointer(struct wayland_surface *w, struct seat *s)
 {
     struct wayland_display *c = w->conn;
-    if (!w->relative || w->pointer_lock || w->destroyed || !s->pointer)
+    if (!w->relative || w->pointer_lock || w->destroyed || !w->surface || !s->pointer)
         return;
     w->pointer_lock = zwp_pointer_constraints_v1_lock_pointer(c->pointer_constraints,
             w->surface, s->pointer, NULL, ZWP_POINTER_CONSTRAINTS_V1_LIFETIME_PERSISTENT);