Follow-up Comment #4, bug #18947 (project mypaint):
This might be fixed by the experimental workaround in
https://gitorious.org/mypaint/mypaint/commit/f38b4b8a52e7f679853992424b8d5cd985efec9c.
I'm not able to reproduce this right now on my system (native Debian
testing/Wheezy, under Gnome3 or Xfce4; Virtualbox guest Ubuntu 12.10 under
Unity) with Intel video hardware, but it seems plausible .
Please could everyone test against the latest git and report back here or on
bug #20311? If you're bitten by this bug, hopefully you'll find that picking
still doesn't work on non-MyPaint windows, but that it's fixed on MyPaint's
own canvases, toolbars and buttons.
Would be interested if you see the colour picker pick pure #ff0000 red
anywhere it shouldn't. I've improved the error checking, and I'm using that
colour as a flag for when grabbing areas of the screen to a pixbuf before
sampling/averaging fails in a detectable way. It won't be enough to fix this
everywhere, but it should allow us to distinguish between fail cases.
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