ecore_wl2: Add API ecore_wl2_window_pending_get()

Lets us test if a commit has been requested but the compositor hasn't
yet told use to draw new content for it.

src/lib/ecore_wl2/Ecore_Wl2.h

@@ -1891,6 +1891,17 @@ EAPI void ecore_wl2_session_recovery_disable(void);
 EAPI void ecore_wl2_window_commit(Ecore_Wl2_Window *window, Eina_Bool flush);
 
 /**
+ * Check if a wayland window's surface is in the pending state.
+ *
+ * A surface is pending if it's been commit but we haven't received a
+ * frame callback for it yet.  This mean's we're not ready to draw yet.
+ *
+ * @return whether the window's surface is pending or not.
+ *
+ * @since 1.20
+ */
+EAPI Eina_Bool ecore_wl2_window_pending_get(Ecore_Wl2_Window *window);
+
 # endif
 
 # undef EAPI

src/lib/ecore_wl2/ecore_wl2_window.c

@@ -1357,3 +1357,10 @@ EAPI void ecore_wl2_window_commit(Ecore_Wl2_Window *window, Eina_Bool flush)
 
    if (flush) wl_surface_commit(window->surface);
 }
+
+EAPI Eina_Bool ecore_wl2_window_pending_get(Ecore_Wl2_Window *window)
+{
+   EINA_SAFETY_ON_NULL_RETURN_VAL(window, EINA_FALSE);
+
+   return window->commit_pending;
+}