winex11.drv: style changes can change a managed window to unmanaged

[Ken Thomases]

This fixes an issue with Internet Explorer's tooltips.  On the Mac, at least,
they steal focus from the main window, disrupting user interaction.
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  dlls/winex11.drv/winpos.c |    9 +++++++++
  1 files changed, 9 insertions(+), 0 deletions(-)
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