explorer: Create a standalone tray window wrapper if the driver doesn't provide native implementation. Take 2.

[Alexandre Julliard]

Dmitry Timoshkov <dmitry at codeweavers.com> writes:

> This patch makes sure that "Shell_TrayWnd" window doesn't have a caption
> since some apps depend on it being empty. The bug #20129 lists one of such
> applications. It does FindWindow("Shell_TrayWnd", "") and expects that it
> returns a valid tray window handle.

This looks ugly when moving the window. The real systray should most
likely be kept off-screen.

-- 
Alexandre Julliard
julliard at winehq.org