added ScBulkBroadcast to ScSimpleUndo::BroadcastChanges()

... to prevent repeated broadcasts to identical range listeners.

Change-Id: Iccbcb27fe03a957c9e448683e6bdc85538c25c3a

sc/source/ui/undo/undobase.cxx

@@ -29,6 +29,7 @@
 #include "attrib.hxx"
 #include "queryparam.hxx"
 #include "subtotalparam.hxx"
+#include "bcaslot.hxx"
 #include "globstr.hrc"
 
 // STATIC DATA -----------------------------------------------------------
@@ -147,6 +148,8 @@ void ScSimpleUndo::BroadcastChanges( const ScRange& rRange )
     ScDocument* pDoc = pDocShell->GetDocument();
     pDoc->CellContentModified();
 
+    ScBulkBroadcast aBulkBroadcast( pDoc->GetBASM());
+
     ScHint aHint(SC_HINT_DATACHANGED, ScAddress());
     ScAddress& rPos = aHint.GetAddress();
     for (SCTAB nTab = rRange.aStart.Tab(); nTab <= rRange.aEnd.Tab(); ++nTab)