input(macOS): preserve Caps Lock key releases - #7840
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macOS exposes Caps Lock as a locking modifier without a physical key-up event, which leaves it held in QEMU guests when the treated-as-key option is enabled. Temporarily map Caps Lock to F19 while input is captured, translate its normal key events back to the guest scan code, and restore the host mapping when capture ends or UTM recovers. Fixes utmapp#7838 Assisted-by: Codex:gpt-5
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Summary
Resolves #7838
Testing
Tested by a human on a MacBook Pro with Apple M5 Max running macOS 26.6.2, using Windows 11 ARM as a QEMU guest with NVDA.
Verified repeated commands while Caps Lock remained held, normal input after releasing Caps Lock, and restoration of the host keyboard mapping after releasing VM input.
The author acknowledges that this change has been tested and/or reviewed by a human in accordance with UTM's AI contribution guidelines.