Current xfwm4 wire frame has no name nor class property, that's OK if one is using the integrated compositor. But if user like me, is using standalone compositor like compton/xcompmgr and enabled shadow, then compositor will draw shadows for the wire frame windows created at alt-tab. Which is quite wired and ugly. Currently, compton user can disable exclude shadow for wire frame using "! name ~= ''", but that will also exclude shadow for any window which doesn't has a name. If wire frame has a windows class or name, it will be much accurate for compton to match. There is already a RFC patch for reference: https://github.com/chjj/compton/issues/128 Thanks.
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