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I'm using a window manager and compositor in Ubuntu. I have blur enabled for transparent windows, which means that when I take a screenshot with gnome-screenshot, the content I'm trying to take a picture of is blurred. With xprop, or some other tool, how do I identify the class of the screenshot window so that I can add it to my blur-exclude rule in my compositor config?

When I start xprop, then take a screenshot and click on the screenshot window, I'm prompted with the following, which doesn't give me any information about the class of the window:

$ xprop WM_CLASS


X Error of failed request:  BadWindow (invalid Window parameter)
Major opcode of failed request:  20 (X_GetProperty)
Resource id in failed request:  0x4001a3
Serial number of failed request:  33
Current serial number in output stream:  33
  • gnome-screenshot intercepts the mouseclick event, does its trick, and exits before xprop sees the mouseclick event. Read man xprop AND all the man pages mentioned in the "SEE ALSO" section. Use one of the information dumpers that runs unconditionally (without a mouseclick), preface it with sleep 25; , take up to 20 seconds to start gnome-screenshot, but don't mouseclick, wait 15 seconds, then click. – waltinator Sep 08 '20 at 20:33

1 Answers1

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The command xprop WM_CLASS will not work as you expect. Consult man xprop to learn how the program works. To obtain the WM_CLASS and filter out any other information, use

xprop | grep WM_CLASS
vanadium
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