[gtk+] GtkTreeView: Avoid device query on collapsing rows

[Carlos Garnacho <carlosg src gnome org>]

commit a5f9dc12849b1b2efcc5c452fef5e3d99c70a172
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jan 21 15:21:16 2016 +0100

    GtkTreeView: Avoid device query on collapsing rows
    
    The pointer position is queried to properly trigger the prelight
    updates on the new row below it. We store the last coordinates
    though, and track crossing events to unset these, so it's safe
    to just update_prelight() here on these.

 gtk/gtktreeview.c |   21 +++------------------
 1 files changed, 3 insertions(+), 18 deletions(-)
---
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index c17bddf..b0688e3 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -12893,9 +12893,7 @@ gtk_tree_view_real_collapse_row (GtkTreeView *tree_view,
   GtkTreeIter iter;
   GtkTreeIter children;
   gboolean collapse;
-  gint x, y;
   GList *list;
-  GdkWindow *child;
   gboolean selection_changed, cursor_changed;
 
   if (animate)
@@ -13004,22 +13002,9 @@ gtk_tree_view_real_collapse_row (GtkTreeView *tree_view,
   g_signal_emit (tree_view, tree_view_signals[ROW_COLLAPSED], 0, &iter, path);
   
   if (gtk_widget_get_mapped (GTK_WIDGET (tree_view)))
-    {
-      GdkSeat *seat;
-
-      seat = gdk_display_get_default_seat (gtk_widget_get_display (GTK_WIDGET (tree_view)));
-      /* now that we've collapsed all rows, we want to try to set the prelight again */
-      child = gdk_window_get_device_position (gdk_window_get_parent (tree_view->priv->bin_window),
-                                              gdk_seat_get_pointer (seat),
-                                              &x, &y, NULL);
-      if (child == tree_view->priv->bin_window)
-       {
-          y = MAX (0, TREE_WINDOW_Y_TO_RBTREE_Y (tree_view, y));
-
-          _gtk_rbtree_find_offset (tree_view->priv->tree, y, &tree, &node);
-          prelight_or_select (tree_view, tree_view->priv->tree, node, x, y);
-       }
-    }
+    update_prelight (tree_view,
+                     tree_view->priv->event_last_x,
+                     tree_view->priv->event_last_y);
 
   return TRUE;
 }