What process created this X11 window?
Recently I've been bugged by a mysterious invisible window in X on my Ubuntu machine. It takes the form of an always-top-most window with absolutely nothing showing; no window border, no content, no nothing. That means that entire area of the screen is now unusable with any pointer, since the window captures all events in it's context - I can't even click on the desktop in that area !
As you might have guess this is rather annoying, and I want to get rid of it permanently.
xwininfo on it gives the following:
xwininfo: Window id: 0x1601b9f (has no name) [...] Map State: IsViewable Override Redirect State: yes Corners: +395+315 -383+315 -383-263 +395-263 -geometry 502x222+395+315
So, I've got an ID, but no name. This fortunately means I can kill it with
xkill, but unfortunately means I have no idea what created it.
So what I'm looking for is some advice or help finding a way to identify the root and cause of this window.
Any suggestions ?