Code freeze break request for eog

[Felix Riemann <friemann gnome org>]

Hi!

I'd like to request a code freeze break for Eye of GNOME to fix bug
746336[1].

The fix is a one-liner (attached to bug) for a crasher that started
showing up in F22. It is caused by the timeout for new overlaid buttons
not being cleaned up when a window is closed.

It's unfortunately pretty easy to produce if you have multiple images
opened in the same instance and close a window while the buttons are
still visible. I'd like to fix it for 3.16.0 as the problematic
multi-window setup can easily happen, e.g. by clicking through images in
Nautilus and eog being single-instance by default.

Regards,

Felix

[1] https://bugzilla.gnome.org/show_bug.cgi?id=746336