From 951a45f90eb24c34f97fda0d71f5fb5baa3d6108 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Thu, 8 Nov 2012 23:06:07 +0100
Subject: [PATCH] Optimazation of tree view when clearing selection

---
 src/Gui/Tree.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Gui/Tree.cpp b/src/Gui/Tree.cpp
index bca4d8e2b..7e8d7b7eb 100644
--- a/src/Gui/Tree.cpp
+++ b/src/Gui/Tree.cpp
@@ -985,9 +985,12 @@ void DocumentItem::setObjectSelected(const char* name, bool select)
 
 void DocumentItem::clearSelection(void)
 {
+    // Block signals here otherwise we get a recursion and quadratic runtime
+    bool ok = treeWidget()->blockSignals(true);
     for (std::map<std::string,DocumentObjectItem*>::iterator pos = ObjectMap.begin();pos!=ObjectMap.end();++pos) {
-        treeWidget()->setItemSelected(pos->second, false);
+        pos->second->setSelected(false);
     }
+    treeWidget()->blockSignals(ok);
 }
 
 void DocumentItem::updateSelection(void)