rendercontext: Fix rendering of double-buffered menubar.
rendercontext: Fix rendering of double-buffered menubar.

Change-Id: Iea74564ef0ae2188ae29f106c4416df1fe827b42

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core