tdf#133976 increase the layout cache size during export

shaves 50% off the export time

Change-Id: I82f5bdcc3ad0dce21881608815bcc81f1ed3f284
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/191731
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@collabora.com>

sw/source/core/text/EnhancedPDFExportHelper.cxx

@@ -2339,6 +2339,11 @@ void SwEnhancedPDFExportHelper::EnhancedPDFExport(LanguageType const eLanguageDe
     const bool bOldLockView = mrSh.IsViewLocked();
     mrSh.LockView( true );
 
+    // tdf#133976 speeds up export greatly
+    SwTextFrame::GetTextCache()->IncreaseMax( 10000 );
+    const ::comphelper::ScopeGuard aGuard(
+        []() mutable { SwTextFrame::GetTextCache()->DecreaseMax( 10000 ); } );
+
     if ( !mbEditEngineOnly )
     {
         assert(pPDFExtOutDevData->GetSwPDFState() == nullptr);