Bug#744249: libgtk-3-0: gtk 3.12 breaks usability by forcing client side decorations on X11

[Vlad Orlov]

Quick follow-up:

Well, sub-windows might have been fixed, but the apps that use CSD in their
main window (gthumb, devhelp) are not. They still use these weird headers
and can't be resized properly (at least in my MATE).

I'm aware that this bug report is about sub-windows, but that behavior sucks
anyway...