[mutter] cursor-renderer/native: Don't trigger redraw when cursor hidden

[Jonas Ådahl <jadahl src gnome org>]

commit 596b30096d86961506705dda134e9ee2330370fa
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri May 11 13:23:39 2018 +0200

    cursor-renderer/native: Don't trigger redraw when cursor hidden
    
    When a cursor is hidden, the native backend will properly hide the HW
    cursor sprite as well, but it would communicate this as if the cursor
    was not handled by the backend, while in fact it still was. This caused
    the generic cursor rendering layer to queue a redraw.
    
    https://gitlab.gnome.org/GNOME/mutter/issues/77

 src/backends/native/meta-cursor-renderer-native.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/backends/native/meta-cursor-renderer-native.c 
b/src/backends/native/meta-cursor-renderer-native.c
index c8ebe3bff..910eb10ec 100644
--- a/src/backends/native/meta-cursor-renderer-native.c
+++ b/src/backends/native/meta-cursor-renderer-native.c
@@ -685,7 +685,10 @@ meta_cursor_renderer_native_update_cursor (MetaCursorRenderer *renderer,
 
   priv->has_hw_cursor = should_have_hw_cursor (renderer, cursor_sprite);
   update_hw_cursor (native, cursor_sprite);
-  return priv->has_hw_cursor;
+
+  return (priv->has_hw_cursor ||
+          !cursor_sprite ||
+          !meta_cursor_sprite_get_cogl_texture (cursor_sprite));
 }
 
 static void