user32: Redraw children when the combo box is dropped down.
Some applications subclass the combo box and handle WM_ERASEBKGND themselves,
without using WS_CLIPCHILDREN. This causes them to erase over the editbox
child, so it requires a refresh as well.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=22260Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
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