winex11.drv: Disable WM while positioning window (TRY 2)

[Peter Dons Tychsen]

Hello,

Changes from TRY1:
* Only use this code-path if necessary (managed windows). Prevents
corrupting the override_redirect bit.

This fixes:
http://bugs.winehq.org/show_bug.cgi?id=15346

Theory:

As documented here:
http://tronche.com/gui/x/xlib/window/attributes/override-redirect.html

We cannot use the X API to move the window, as the WM might limit or
interfere with the movement in many ways. An example is that Wine cannot
move a window (with SetWindowPos) partially out of the desktop left-ward
in Metacity or Compiz.

As documented in the link above, overriding the WM with
override_redirect temporarily fixes the problem.

Thanks,

/pedro
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