[GG2R10]

Problem

Running the Windows build under Wine/Proton (recent versions, e.g. GE-Proton 11),
the mouse is not detected at all: no cursor movement, no clicks. The log shows:

Found 2 DirectInput devices:
   1: 'Wine Mouse' axes: 0, hats: 0, buttons: 0 (buffered)

Cause

DIDevice::Open enumerates the mouse objects with:

Device->EnumObjects(DIMouse_EnumDevObjectsProc, this,
                    DIDFT_BUTTON | DIDFT_AXIS | DIDFT_ANYINSTANCE);

DIDFT_ANYINSTANCE is meant to identify an object's instance (it is part of
dwType), not to be used as an EnumObjects filter. Native Windows and older
Wine ignore the extra bits, but current Wine validates the flags and returns
DIERR_INVALIDPARAM if anything other than DIDFT_AXIS | DIDFT_POV | DIDFT_BUTTON | DIDFT_NODATA | DIDFT_COLLECTION is passed
(dlls/dinput/device.c, dinput_device_EnumObjects).

The return value is not checked, so the mouse ends up registered with an empty
Inputs list. The DirectInput thread then never emits mouse events, and the
cursor location (updated from GetCursorPos when an event is processed) is
never refreshed either.

Fix

Pass only DIDFT_BUTTON | DIDFT_AXIS, which is what the callback actually
handles. The SupportedMask check in DIMouse_EnumDevObjectsProc is updated
accordingly, and a failing EnumObjects is now logged.

Testing

• Built from this branch with the project's CI on my fork (all jobs green,
  including Windows x64).
• Ran that Windows build under GE-Proton 11-3 on Arch Linux (KDE Plasma,
  Wayland): the mouse is now detected ('Wine Mouse' axes: 3, hats: 0, buttons: 5) and works in menus. Before the change it reported 0 axes and
  0 buttons and the mouse did nothing.
• Not tested on native Windows. As far as I know the removed bits had no
  effect there.

I used an AI assistant to help investigate and draft this change; I tested it myself.

[poco0317]

this pull request is AI generated

[GG2R10]

mb, didn't know you had no AI policy. Can i redo the PR with my own words? It's a useful fix and I already tested it with the compiled windows version.