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, 15 insertions, 0 deletions

diff --git a/src/platform/wayland/internal.h b/src/platform/wayland/internal.h
index a479e2b..92108c1 100644
--- a/src/platform/wayland/internal.h
+++ b/src/platform/wayland/internal.h
@@ -251,6 +251,10 @@ struct wayland_display {
     struct conn_drag drag;
     struct wayland_surface *surfaces;
     struct wayland_surface *dead;
+    /* While lost: retries a connection; stale marks objects of the dead one. */
+    yasl_private_timer_id reconnect_timer;
+    uint64_t reconnect_delay_ns;
+    bool stale;
 
     /* 4-byte integers */
     int cursor_size;
@@ -287,7 +291,12 @@ struct wayland_surface {
     EGLSurface egl_surface;
     EGLContext egl_context;
     EGLConfig egl_config;
+    struct yasl_private_gl_options gl_options;
+    struct wayland_surface *gl_share;
+    bool gl_built;
 #endif
+    char *title;
+    bool tearing;
     struct xdg_surface *xdg_surface;
     struct xdg_toplevel *toplevel;
     struct xdg_popup *popup;
@@ -393,6 +402,12 @@ void surface_draw_frame(struct wayland_surface *w);
 void wayland_surface_arm_frame(struct wayland_surface *w);
 void surface_fail(struct wayland_surface *w);
 void display_leave(struct wayland_display *c);
+/* Native objects of a toplevel: built at creation and again after a reconnect. */
+int  surface_build_toplevel(struct wayland_surface *w, bool fullscreen);
+void surface_release_native(struct wayland_surface *w);
+#if YASL_HAS_EGL
+bool surface_build_gl(struct wayland_surface *w);
+#endif
 
 static inline struct wayland_surface *surface_root(struct wayland_surface *w)
 {