Memory leak on Windows on some setups

[AltGr]

the windows version memory usage grows by a few MB every time you do any action...) it may crash the application once there is no more free memory (takes a while).

This turns out to be a known GTK bug (https://bugzilla.gnome.org/show_bug.cgi?id=685959 ; and maybe https://bugzilla.gnome.org/show_bug.cgi?id=671538). These have been fixed recently (2.24.14 I think), but the binary GTK package I use (2.24.10) is older than that.

So this may need rebuilding a more recent gtk2 on windows before packaging.