SetBkMode(TRANSPARENT) already indicates that the parent background should remain untouched.
Drawing parent background destroys any previous content that applications drawn and some
applications rely on the content being unchanged.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51914Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>