Move addCellDataFunc code into an idle
Move addCellDataFunc code into an idle

BGO#617484: Accerciser crashes with the latest at-spi2.
This is a work-around for at-spi2 re-entering the main loop and possibly
causing gtk events to be delivered prematurely if at-spi calls are made.

javihernandez/accerciser-mirror,GNOME/accerciser,javihernandez/accerciser-mirror,GNOME/accerciser