Piotr Piastucki authored Feb 19, 2011 and Kai Willadsen committed Feb 24, 2011

Both meld and gtksourceviewgutter handle expose-event to draw gutter
content, however, gtksourceviewgutter handler gets invoked first.
There seems to be no way to change the order of GTK signal handlers,
so another expose-event is emitted again after diff coloured block is
drawn to trigger gtksourceviewgutter handler.