[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 #19 from Olivier F. R. Dierick <o.dierick at piezo-forte.be> ---
I have a feeling of deja-vu. I'll not fight over which patch is better.

I tested my patch with different mixes of Aliens versus Predator Classic 2000
(for the resolution switching), Steam (for maximizing window/its systray icon),
notepad (to cover the taskbar) and taskmgr(for its systray icon), and I can
confirm that my patch keeps the taskbar from covering anything.

I think it is an undesired side effect of do_show_systray() to push the taskbar
to the top of the z order. The few events that trigger a call to
do_show_systray() don't require it to be pushed on top of the z order. They
are: - show_icon() → when an icon is added to the systray;
- tray_wndproc() case WM_DISPLAYCHANGE → when resolution changes;
- initialize_systray() → At the virtual desktop creation;
There is no reason to put the taskbar on top of other window in any of these
events.

Adding an option to put the taskbar 'always on top' would need other design
changes outside the scope of this bug (window create/move/maximize would have
to take the taskbar area into account, this is not implemented AFAICT).

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