The text curser will blink while it's moving. It's very distracting and gives the impression that it's flashing randomly.
I just checked and the text cursor in other gtk applications (namely evolution) does not blink while holding down the space bar. Anybody know how to tell gtk not to blink the cursor?
It is a race condition between the cursor blink and callback. All gtk entries have the race condition, but if the callback is simple the the blinking occurs too rapidly to notice. The only ways to eliminate it are to change the blink rate or eliminate all blink. This can't be done (legitimately, AFAIK) in gtk.