RFC: xfwm4: drop legacy KDE systray emulation

[Matt Connell]

On Wed, 2022-10-19 at 16:47 +0200, Enrico Weigelt, metux IT consult
wrote:
> Feel free to test my patch :)
> (Gentoo makes adding custom patches quite easy).

I'll do that and get back to you.

I suspect you're correct that this is something unrelated to what I
use.  I can't imagine *nobody* wanting the feature.  Where else would
"I want to close this window but leave the application running" icons
live?