forward_mkb_frame early-returned the whole mouse block when mirroring was off or
ImGui wanted the mouse, and the top-level gates returned when the subsystem was
off / focus was lost / the game died. A key or mouse button held at that moment
never got its KeyUp/MouseUp, so it stuck DOWN in the guest -- a held mouse button
fires continuously, a held key walks forever -- contradicting the "send the up so
nothing sticks" intent.
Track what we've forwarded as held (g_mouse_down / g_key_down) and release it
whenever we stop forwarding for any reason: the can't-forward gate, ImGui grabbing
the keyboard/mouse, or the mouse-not-mirroring path all now release held inputs
before returning. Normal down/up still flips the held state.
Fix by inspection: forward_mkb_frame needs a live ImGui context + injection panel,
so it isn't unit-tested; the logic is a straightforward held-state release.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
BlackMark
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