Windows touch input with raw input turned on does not map correctly

[peppy]

Can reproduce on any surface device (along with other windows touch devices), where cursor position updates work correctly but are constricted to a very small area in the top left of the screen, rather than covering the full window. It looks like the coordinate mapping is going wrong, although I haven't had a chance to investigate further:

osu-framework/osu.Framework/Platform/Windows/WindowsMouseHandler.cs

Line 93 in 6a2250e

if (((int)mouse.Flags & 64) == 0)

As discussed in ppy/osu#16840 (reply in thread).