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:
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