rendercontext: Fix painting of double-buffered listbox.
rendercontext: Fix painting of double-buffered listbox.

Everything after the selected entry was invisible ;-)

Change-Id: I06ee1ac424293e71eaa0654b38a5e74e4462d185

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