bug#31650: 26.1; Desktop mode adds wm stickiness to emacs windows.

[martin rudalics]

> I tried with i3, seems to work correctly (all tests with a floating
> window, since that seems to be a prerequisite for stickyness under i3):
>
> (set-frame-parameter nil 'sticky nil) has no effect
> (set-frame-parameter nil 'sticky t) makes the frame sticky,
> and (set-frame-parameter nil 'sticky nil) makes it unsticky again.
>
> I tested Emacs 26 with both Lucid and GTK builds.

Thanks.  I suppose yours is the usual behavior since otherwise people
used to save and restore their desktops would have complained earlier.

martin