[gnome-builder] tree: reduce function calls in visibility check

[Christian Hergert <chergert src gnome org>]

commit 294004d36098ab947f80c2773612c649f4ba06ab
Author: Christian Hergert <christian hergert me>
Date:   Sun Jun 14 11:31:56 2015 -0700

    tree: reduce function calls in visibility check

 src/tree/gb-tree.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/tree/gb-tree.c b/src/tree/gb-tree.c
index 5d4dfa2..b04f409 100644
--- a/src/tree/gb-tree.c
+++ b/src/tree/gb-tree.c
@@ -240,8 +240,8 @@ check_visible_foreach (GtkWidget *widget,
 {
   gboolean *at_least_one_visible = user_data;
 
-  if (gtk_widget_get_visible (widget))
-    *at_least_one_visible = TRUE;
+  if (*at_least_one_visible == FALSE)
+    *at_least_one_visible = gtk_widget_get_visible (widget);
 }
 
 static GMenu *