It returns an INT, which is quite different to an HRESULT.

winex11: Use XWithdrawWindow to unmap managed windows, and wait until they are withdrawn before mapping them again.

Change WM_STATE to NET_WM_STATE in variable and function names to
avoid confusion with the ICCCM WM_STATE property.

shlwapi: Don't add a trailing slash in the case that nothing has to be appended to relative, with testcase.