[gtk/x11-dnd-fixes: 5/7] x11: Keep a ref on GdkDrag objects

[Matthias Clasen <matthiasc src gnome org>]

commit f93d0f8fb5e6660126e5b4c35b2b9d8d5f189816
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Feb 22 18:32:37 2020 -0500

    x11: Keep a ref on GdkDrag objects
    
    It is expected that backends keep a ref on the GdkDrag
    objects that they create as long as the drag is ongoing.

 gdk/x11/gdkdrag-x11.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/gdk/x11/gdkdrag-x11.c b/gdk/x11/gdkdrag-x11.c
index 48ad2b6862..c2bd36682a 100644
--- a/gdk/x11/gdkdrag-x11.c
+++ b/gdk/x11/gdkdrag-x11.c
@@ -900,16 +900,12 @@ gdk_x11_drag_handle_finished (GdkDisplay   *display,
 
   if (drag)
     {
-      g_object_ref (drag);
-
       drag_x11 = GDK_X11_DRAG (drag);
       if (drag_x11->version == 5)
         drag_x11->drop_failed = xevent->xclient.data.l[1] == 0;
 
       g_signal_emit_by_name (drag, "dnd-finished");
       gdk_drag_drop_done (drag, !drag_x11->drop_failed);
-
-      g_object_unref (drag);
     }
 }
 
@@ -1896,6 +1892,7 @@ gdk_x11_drag_drop_done (GdkDrag  *drag,
   if (success)
     {
       gdk_surface_hide (x11_drag->drag_surface);
+      g_object_unref (drag);
       return;
     }
 
@@ -1928,6 +1925,7 @@ gdk_x11_drag_drop_done (GdkDrag  *drag,
                            gdk_drag_anim_timeout, anim,
                            (GDestroyNotify) gdk_drag_anim_destroy);
   g_source_set_name_by_id (id, "[gtk] gdk_drag_anim_timeout");
+  g_object_unref (drag);
 }
 
 static gboolean
@@ -2097,7 +2095,7 @@ _gdk_x11_surface_drag_begin (GdkSurface         *surface,
       g_object_unref (drag);
       return NULL;
     }
-  
+ 
   move_drag_surface (drag, x_root, y_root);
 
   x11_drag->timestamp = gdk_display_get_last_seen_time (display);
@@ -2113,7 +2111,10 @@ _gdk_x11_surface_drag_begin (GdkSurface         *surface,
       return NULL;
     }
 
+  
   g_signal_connect_object (display, "xevent", G_CALLBACK (gdk_x11_drag_xevent), drag, 0);
+  /* backend holds a ref until gdk_drag_drop_done is called */
+  g_object_ref (drag);
 
   return drag;
 }