Related: #i124065# Low performance opening attached .ods

(cherry picked from commit d89ee4f6)

Conflicts:
	sc/inc/document.hxx
	sc/source/core/data/documen3.cxx
	sc/source/ui/unoobj/nameuno.cxx

Change-Id: Iced475cefe1df62920535db252841fe40339ebb1

sc/source/core/data/documen3.cxx

@@ -200,11 +200,13 @@ void ScDocument::SetRangeName(SCTAB nTab, ScRangeName* pNew)
 
 void ScDocument::SetRangeName( ScRangeName* pNewRangeName )
 {
+    if (pRangeName == pNewRangeName)
+        return;
+
     delete pRangeName;
     pRangeName = pNewRangeName;
 }
 
-
 const ScRangeData* ScDocument::GetRangeAtBlock( const ScRange& rBlock, OUString* pName ) const
 {
     const ScRangeData* pData = NULL;