FVWM doesn't respect PPosition hints by default and tries to tile a window according to its rules.
This might break tests that require a window at a specific position. For example, when setting the
caption bar height to anything other than 18, some user32 tests start to fail. They succeeded
previously just because the caption bar and border height on FVWM totals to 18, which is happens to
be the same value used by Wine by default.