[glade/tintou/dnd-regression] gladeui: Fix crash on drag-n-drop

[Corentin Noël <corentinnoel src gnome org>]

commit f130e6673e27ca32ba7c6a55efab6cb4803de0d1
Author: Corentin Noël <corentin noel collabora com>
Date:   Tue Sep 3 15:10:16 2019 +0200

    gladeui: Fix crash on drag-n-drop
    
    The arguments of on_source_drag_end were mismatched

 gladeui/glade-design-view.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)
---
diff --git a/gladeui/glade-design-view.c b/gladeui/glade-design-view.c
index b9322d31..35ac2e75 100644
--- a/gladeui/glade-design-view.c
+++ b/gladeui/glade-design-view.c
@@ -616,7 +616,8 @@ glade_design_view_drag_leave (GtkWidget      *widget,
                               GdkDragContext *context,
                               guint           time)
 {
-  GladeDesignViewPrivate *priv = glade_design_view_get_instance_private ((GladeDesignView *) widget);
+  GladeDesignView *view = GLADE_DESIGN_VIEW (widget);
+  GladeDesignViewPrivate *priv = glade_design_view_get_instance_private (view);
 
   if (priv->drag_target)
     glade_design_view_drag_highlight (priv->drag_target, -1, -1);
@@ -627,7 +628,7 @@ on_source_drag_end (GtkWidget       *widget,
                     GdkDragContext  *context, 
                     GladeDesignView *view)
 {
-  GladeDesignViewPrivate *priv = glade_design_view_get_instance_private ((GladeDesignView *) widget);
+  GladeDesignViewPrivate *priv = glade_design_view_get_instance_private (view);
   
   if (priv->drag_target)
     {
@@ -653,11 +654,7 @@ glade_design_view_drag_data_received (GtkWidget        *widget,
 
   g_signal_handlers_disconnect_by_func (source, on_source_drag_end, view);
 
-  g_clear_object (&priv->drag_data);
-  priv->drag_data = _glade_dnd_get_data (context, selection, info);
-
-  if (priv->drag_data)
-    g_object_ref (priv->drag_data);
+  g_set_object (&priv->drag_data, _glade_dnd_get_data (context, selection, info));
 
   g_signal_connect_object (source, "drag-end", G_CALLBACK (on_source_drag_end), view, 0);
 }