[gtksourceview/gtksourcecompletion] Do not handle selection changes when the completion window is invisible

[Jesse van den Kieboom <jessevdk src gnome org>]

commit cd3796b59b1d4746476b9ab8c70a961f9ee42560
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Sat Sep 19 18:32:36 2009 +0200

    Do not handle selection changes when the completion window is invisible
    
    This fixes some bugs when hiding the completion window which were
    triggered by clearing the model

 gtksourceview/gtksourcecompletion.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourcecompletion.c b/gtksourceview/gtksourcecompletion.c
index 375560c..b20ad33 100644
--- a/gtksourceview/gtksourcecompletion.c
+++ b/gtksourceview/gtksourcecompletion.c
@@ -911,6 +911,11 @@ static void
 selection_changed_cb (GtkTreeSelection    *selection, 
 		      GtkSourceCompletion *completion)
 {
+	if (!GTK_WIDGET_VISIBLE (completion->priv->window))
+	{
+		return;
+	}
+
 	if (get_selected_proposal (completion, NULL, NULL))
 	{
 		completion->priv->select_first = FALSE;