[gtk+] treeview: Add back the Gdk pointer grab during column dragging

[Matthias Clasen <matthiasc src gnome org>]

commit edc5cb4e473c8036e56eb86f4d16cf1c36ecb43e
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 9 16:20:01 2014 +0200

    treeview: Add back the Gdk pointer grab during column dragging
    
    The reparenting happening on the column header so it gets a movable
    window breaks the implicit grab, so this is one situation were we
    want a pointer grab, if just to replace it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732933

 gtk/gtktreeview.c |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index 7a64921..adc4561 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -3533,7 +3533,11 @@ gtk_tree_view_column_drag_gesture_end (GtkGestureDrag *gesture,
     tree_view->priv->cur_reorder = NULL;
 
   if (tree_view->priv->in_column_drag)
-    gtk_tree_view_button_release_drag_column (tree_view);
+    {
+      gtk_tree_view_button_release_drag_column (tree_view);
+      gdk_device_ungrab (gtk_gesture_get_device (GTK_GESTURE (gesture)),
+                         GDK_CURRENT_TIME);
+    }
   else if (tree_view->priv->in_column_resize)
     gtk_tree_view_button_release_column_resize (tree_view);
 }
@@ -9999,6 +10003,19 @@ _gtk_tree_view_column_start_drag (GtkTreeView       *tree_view,
 
   tree_view->priv->in_column_drag = TRUE;
 
+  /* Widget reparenting above unmaps and indirectly breaks
+   * the implicit grab, replace it with an active one.
+   */
+  gdk_device_grab (device,
+                   tree_view->priv->drag_window,
+                   GDK_OWNERSHIP_NONE,
+                   FALSE,
+                   GDK_TOUCH_MASK |
+                   GDK_POINTER_MOTION_MASK |
+                   GDK_BUTTON_RELEASE_MASK,
+                   NULL,
+                   GDK_CURRENT_TIME);
+
   gtk_gesture_set_state (tree_view->priv->column_drag_gesture,
                          GTK_EVENT_SEQUENCE_CLAIMED);
 }