When a wibox is destroyed or detached from a screen, it is wiped to clean up its
resources. This also includes destroying the window which is associated with the
wibox.
The problem here is that if the wibox contains the systray, the systray window
would automatically be destroyed since all childs of a window are destroyed when
said window is destroyed. To fix this, we kick out the systray window before
destroying the wibox' window.
Signed-off-by: Uli Schlachter <psychon@znc.in>
ddedb961d3