[PATCH 0/3] MR4945: user32/tests: Add mouse input tests with layered windows.

[Rémi Bernon (＠rbernon)]

These were in the staging user32-Mouse_Message_Hwnd series, I rewrote them to use the new test helpers. There were more tests with DC regions but I don't think they really belong to the input tests. The fixes are also not completely correct (they don't pass some tests now) so probably would need some investigation.