cursor-renderer/native: Postpone cursor update if modeset is pending

If a modeset is pending, it's likely that the cursor update will not
work; thus, wait with updating the cursor so that it's applied together
with the mode set update.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>

src/backends/native/meta-renderer-native.c

@@ -2102,6 +2102,12 @@ meta_renderer_native_create_dma_buf (CoglRenderer  *cogl_renderer,
   return NULL;
 }
 
+gboolean
+meta_renderer_native_is_mode_set_pending (MetaRendererNative *renderer_native)
+{
+  return renderer_native->pending_unset_disabled_crtcs;
+}
+
 gboolean
 meta_onscreen_native_is_buffer_scanout_compatible (CoglOnscreen *onscreen,
                                                    uint32_t      drm_format,