[Bug 40828] Switching resolution in desktop mode makes task bar redraw on top of full screen game

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=40828

--- Comment #20 from Zebediah Figura <z.figura12 at gmail.com> ---
Created attachment 63197
  --> https://bugs.winehq.org/attachment.cgi?id=63197
adjusted version of Olivier's patch

When an application makes itself fullscreen, does that involve anything more
than just setting its window to the size of the whole screen? Does it make the
window topmost as well? Is there some other magic involved?

IIRC, a normal window always goes behind the taskbar on Windows, and a topmost
window always goes over it. That's certainly consistent with the taskbar being
topmost itself (and, I guess, unfocusable?)

Why is do_show_systray() called in show_icon()? The conditions under which the
taskbar is shown are, I suppose, not immediately clear.

I think the approach of using SWP_NOZORDER makes sense in principle; when the
display changes we need to resize the taskbar, but we don't want to reorder it.
However, unless I'm mistaken SWP_NOZORDER implies that the ordering parameter
to SetWindowPos() is ignored entirely, so I'd do something like the attached
instead. Does this make more sense?

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