ecore_wl2: Add new API to latch window state for updates

Add an API to call at the beginning of render to latch state at
that moment, and use it for the wayland engine.

src/lib/ecore_wl2/Ecore_Wl2.h

@@ -1957,6 +1957,21 @@ EAPI void ecore_wl2_display_flush(Ecore_Wl2_Display *display);
 
 EAPI Eina_Bool ecore_wl2_window_resizing_get(Ecore_Wl2_Window *window);
 
+/**
+ * Latch window state at the start of an update
+ *
+ * When async render takes place we continue to dispatch wayland
+ * events from the main loop. We need to defer any changes to
+ * window state from those events until the update is complete.
+ *
+ * Events deferred during an update will automatically fire
+ * immediately after the caller calls ecore_wl2_window_commit.
+ *
+ * @param window
+ * @since 1.21
+ */
+EAPI void ecore_wl2_window_update_begin(Ecore_Wl2_Window *window);
+
 # endif
 
 # undef EAPI

src/lib/ecore_wl2/ecore_wl2_private.h

@@ -233,6 +233,7 @@ struct _Ecore_Wl2_Window
         unsigned int count;
      } wm_rot;
    Eina_Bool has_buffer : 1;
+   Eina_Bool updating : 1;
 };
 
 struct _Ecore_Wl2_Output

src/lib/ecore_wl2/ecore_wl2_window.c

@@ -1408,6 +1408,7 @@ ecore_wl2_window_commit(Ecore_Wl2_Window *window, Eina_Bool flush)
         wl_surface_commit(window->surface);
         ecore_wl2_display_flush(window->display);
      }
+   window->updating = EINA_FALSE;
 }
 
 EAPI Eina_Bool
@@ -1468,3 +1469,11 @@ ecore_wl2_window_resizing_get(Ecore_Wl2_Window *window)
 
    return window->req_config.resizing;
 }
+
+EAPI void ecore_wl2_window_update_begin(Ecore_Wl2_Window *window)
+{
+   EINA_SAFETY_ON_NULL_RETURN(window);
+   EINA_SAFETY_ON_TRUE_RETURN(window->updating);
+
+   window->updating = EINA_TRUE;
+}

src/modules/ecore_evas/engines/wayland/ecore_evas_wayland_common.c

@@ -1710,6 +1710,7 @@ _ecore_evas_wl_common_render_flush_pre(void *data, Evas *evas, void *event EINA_
 
    if (!ecore_wl2_window_shell_surface_exists(wdata->win)) return;
 
+   ecore_wl2_window_update_begin(wdata->win);
    if (wdata->win->zxdg_configure_ack && wdata->win->req_config.serial &&
        (wdata->win->req_config.serial != wdata->win->set_config.serial))
      wdata->win->zxdg_configure_ack(wdata->win->zxdg_surface,