tdf#119650 slow saving spreadsheet with comments, part 1

Reducing the number of times the editeng needs to reformat text takes
saving from from 278s to 151s

Change-Id: I32ba0ab65b4dc0f268cc2cda802570673a316ea0
Reviewed-on: https://gerrit.libreoffice.org/71358
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

editeng/source/outliner/outliner.cxx

@@ -407,12 +407,15 @@ void Outliner::SetText( const OUString& rText, Paragraph* pPara )
 {
     DBG_ASSERT(pPara,"SetText:No Para");
 
+    sal_Int32 nPara = pParaList->GetAbsPos( pPara );
+
+    if (pEditEngine->GetText( nPara ) == rText)
+        return; // do nothing
+
     bool bUpdate = pEditEngine->GetUpdateMode();
     pEditEngine->SetUpdateMode( false );
     ImplBlockInsertionCallbacks( true );
 
-    sal_Int32 nPara = pParaList->GetAbsPos( pPara );
-
     if (rText.isEmpty())
     {
         pEditEngine->SetText( nPara, rText );