[gtk+] GtkTreeViewColumn: fix return value of gtk_tree_view_column_cell_get_position()

[Michael Natterer <mitch src gnome org>]

commit 33f7754a713969e26d3cc15b3543c5c3b35851a2
Author: Michael Natterer <mitch gimp org>
Date:   Sun Sep 25 14:50:31 2011 +0200

    GtkTreeViewColumn: fix return value of gtk_tree_view_column_cell_get_position()
    
    Return FALSE again if the passed in cell is not part of the column.
    It was always returning TRUE since GtkCellArea was introduced.

 gtk/gtktreeviewcolumn.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtktreeviewcolumn.c b/gtk/gtktreeviewcolumn.c
index af79da7..00c9a89 100644
--- a/gtk/gtktreeviewcolumn.c
+++ b/gtk/gtktreeviewcolumn.c
@@ -3095,6 +3095,9 @@ gtk_tree_view_column_cell_get_position (GtkTreeViewColumn *tree_column,
 
   priv = tree_column->priv;
 
+  if (! gtk_cell_area_has_renderer (priv->cell_area, cell_renderer))
+    return FALSE;
+
   gtk_tree_view_get_background_area (GTK_TREE_VIEW (priv->tree_view),
                                      NULL, tree_column, &cell_area);