starmath: no need to set those on every paint event
starmath: no need to set those on every paint event

Change-Id: Ife149baf15d6f38a2a316e124b78bdb7e1b64967

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