[Bug 57849] New: Multiple games: sleep accuracy is affected by mouse movement speed

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57849

Bug ID: 57849
           Summary: Multiple games: sleep accuracy is affected by mouse
                    movement speed
           Product: Wine
           Version: 10.1
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wineserver
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

I noticed a problem occurring in osu! (stable) and AimLabs, where the in-game
frame limiter would suddenly have worse accuracy when the mouse is moved. For
example, an in-game frame limiter of 500fps will show ~2ms frame-time ingame,
but when moving the mouse quick enough it will increase up to ~2.5ms. This
maximum +0.5ms increase is constant from any starting value.

This behavior depends on mouse report rate and movement speed (more reports ->
+0.5ms frame-time is reached faster), and is exacerbated when the wine-staging
`user32-rawinput-mouse` patchset is applied. I can only presume that this is
because there are more more hardware messages exchanged with wineserver (which
the staging patchset further increases).

Furthermore, both of these games use alertable SleepEx to control the frame
limiter.