tdf#126324 Import custom date as custom XTextField

Change-Id: I89f96490a47210e7daa3b21b2399e0dfe0cf3abf
Reviewed-on: https://gerrit.libreoffice.org/81513
Tested-by: Jenkins
Reviewed-by: Tamás Bunth <btomi96@gmail.com>

oox/source/drawingml/textfield.cxx

@@ -67,6 +67,12 @@ void lclCreateTextFields( std::vector< Reference< XTextField > > & aFields,
         OString p( s.pData->buffer + 8 );
         try
         {
+            if(p.startsWith("'"))
+            {
+                xIface = xFactory->createInstance( "com.sun.star.text.TextField.Custom" );
+                aFields.emplace_back( xIface, UNO_QUERY );
+                return;
+            }
             bool bIsDate = true;
             int idx = p.toInt32();
             sal_uInt16 nNumFmt;