When clicking on a GTK+ 3 window while using XFCE, it will randomly start dragging the window around the screen, usually throwing it off the bottom-right of the monitor. This appears to be due to a new NET_WM_MOVERESIZE_CANCEL message that was added to GTK+ 3.4. It is apparently fixed in upstream, so the patch just needs to be added to the current ebuilds. This is an Ubuntu bug report detailing the issue and fix: https://bugs.launchpad.net/ubuntu/+source/xfwm4/+bug/1001936 And this is the upstream bug report: https://bugzilla.xfce.org/show_bug.cgi?id=8949
Patch is here: http://git.xfce.org/xfce/xfwm4/commit/?id=099614e
+*xfwm4-4.10.0-r1 (31 Dec 2012) + + 31 Dec 2012; Samuli Suominen <ssuominen@gentoo.org> +xfwm4-4.10.0-r1.ebuild, + +files/xfwm4-4.10.0-gtk34.patch: + Implement NET_WM_MOVERESIZE_CANCEL message wrt bug #442218. Patch is from + upstream.