Description of problem:
take screenshot of single window (<alt>+<print>), note that in the resulting image the colors are messed up. Screenshots of whole desktop is fine however.
http://frupic.frubar.net/fullsize/35394 ← single window (alt+print, wrong colors), http://frupic.frubar.net/fullsize/35395 ← full desktop (just <print>, correct colors)
upstream bug https://bugzilla.gnome.org/show_bug.cgi?id=779234 and https://bugzilla.gnome.org/show_bug.cgi?id=780744 (marked as duplicate of the former)
patch available (linked in bug):
Awesome bug :)
Fixed in mutter-3.24.3. I had this in testing and had some issues logging in with that version. Seems better to wait for 3.23.4.
Mutter 3.23.4 with related gnome-shell and -extensions has been released. So .. I should do the work :P
poke - so will we get new mutter for mga6 then?