[gtk+] Fix up managed dnd

[Matthias Clasen <matthiasc src gnome org>]

commit f40b3bc5bc1d89c86e2a258505b6239fe2956f0d
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Nov 11 07:46:59 2017 -0500

    Fix up managed dnd
    
    Since commit 6c56d04cee23d3340cf7cf08756c610efe9ccdab,
    we were doing some calls twice in the managed dnd case,
    leading to double drops.

 gtk/gtkdnd.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
index 40c14ee..3caf43a 100644
--- a/gtk/gtkdnd.c
+++ b/gtk/gtkdnd.c
@@ -1905,7 +1905,9 @@ gtk_drag_drop (GtkDragSourceInfo *info,
       if (info->icon_window)
         gtk_widget_hide (info->icon_window);
 
-      gdk_drag_drop (info->context, time);
+      if (!gtk_drag_is_managed (info->widget))
+        gdk_drag_drop (info->context, time);
+
       info->drop_timeout = gdk_threads_add_timeout (DROP_ABORT_TIME,
                                           gtk_drag_abort_timeout,
                                           info);
@@ -2195,7 +2197,8 @@ gtk_drag_cancel_internal (GtkDragSourceInfo *info,
                           guint32            time)
 {
   gtk_drag_end (info, time);
-  gdk_drag_abort (info->context, time);
+  if (!gtk_drag_is_managed (info->widget))
+    gdk_drag_abort (info->context, time);
   gtk_drag_drop_finished (info, result, time);
 }