Follow-up Comment #5, bug #17940 (project mypaint):
There is a problem with that commit: it adds this main_widget.set_sensitive()
call that is causing a full canvas redraw. When working with a big image
fullscreen this takes too much time; the color picker is something that must
respond very fast. You can also enable “visualize rendering” in the debug
menu to see the effect, or just work on a big image fullscreen and zoomed
out.
I just checked GTK source: set_sensitive() always does queue_draw() if the
widget is visible and mapped, so we better don't call it.
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