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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
k-a-v
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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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