Incredible slowness and crashes with document with vast num of frame dups

it looks like draw:name values are supposed to be unique in ODF, even
if it's not spelled out explicitly, since it exists so the frame can be
referenced, which sort of implies that it has to be unique, so a
document where the values aren't unique can be considered invalid

    19.197.10 <draw:frame>
    The draw:name attribute specifies a name by which a <draw:frame>
element can be referenced.

So reject duplicate frames

Change-Id: I83f6d72fd969f667f0a8c2c85d2ffeeed672387a

xmloff/source/text/XMLTextFrameContext.cxx

@@ -585,6 +585,7 @@ void XMLTextFrameContext_Impl::Create( bool /*bHRefOrBase64*/ )
             (!sName.isEmpty() && sOrigName != sName) )
         {
             OUString sOldName( sName );
+
             sal_Int32 i = 0;
             while( xTextImportHelper->HasFrameByName( sName ) )
             {
@@ -593,8 +594,15 @@ void XMLTextFrameContext_Impl::Create( bool /*bHRefOrBase64*/ )
             }
             xNamed->setName( sName );
             if( sName != sOldName )
-                xTextImportHelper->GetRenameMap().Add( XML_TEXT_RENAME_TYPE_FRAME,
+            {
+                bool bSuccess = xTextImportHelper->GetRenameMap().Add( XML_TEXT_RENAME_TYPE_FRAME,
                                              sOldName, sName );
+                if (!bSuccess)
+                {
+                    bCreateFailed = true;
+                    return;
+                }
+            }
         }
     }