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FS#699 - hiding toplevel windows is not supported
User who did this - Uli Schlachter (psychon)

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Ok, from XWithdrawWindow() I googled my way through its man page until I reached the ICCCM 
(InterClient Communication Conventions Manual). Chapter 4 is "Client-to-Window-Manage 
Communication". Chapter 4.1.4 explains "Changing Window State".
For Normal to Withdrawn state, one can read:

Normal ? Withdrawn ? The client should unmap the window and follow it with a 
synthetic UnmapNotify event as described later in this section.

And later:

Advice to Implementors
For compatibility with obsolete clients, window managers should trigger the 
transi-
tion to the Withdrawn state on the real UnmapNotify rather than waiting for the 
syn-
thetic one. They should also trigger the transition if they receive a synthetic 
Unmap-
Notify on a window for which they have not yet received a real UnmapNotify.

So ICCCM mandates that we unmap windows when we receive a synthetic UnmapNotify 
on the root window. This is something we aren't doing currently.

So this really is a bug in awesome (and evilwm, dwm, ....).
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http://awesome.naquadah.org/bugs/index.php?do=details&task_id=699#comment1674

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