menu: remember old Background and restore later
menu: remember old Background and restore later

Change-Id: I1c2bc60729117ea0a4e03a231b4dcce083ecf959

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