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I upgraded my XGL/Compiz set from Quinnstorm packages to the new Beryl-manager. The Gimp has an attitude of keeping several windows open, so trailfocus isn't really helpfull there, so I decided to exclude Gimp from the trailfocus module. That can be accomplished to specifying a WM_CLASS in the Beryl-manager, but what has to be specified there exactly ?

On can find the exact name of a WM_CLASS object by typing the command :

xprop | grep WM_CLASS | cut -d \" -f 4

The cursor then changes to a cross, which enables you to select the application of which you want to know the WM_CLASS.