win32u: Skip minimized windows when looking for another window to activate. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=59010
win32u: Hide owned popups after minimizing their owner window. So they don't try to activate the owner when getting hidden, which might spuriously restore it. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=59010