windows: bump winit to refresh keyboard layout cache on WM_INPUTLANGCHANGE (#8675)

[acarl005]

Description

#8675 ("Punto Switcher freezes Warp") links a chain that I could not treat as reliable: this repo's winit fork PR #15, rust-windowing/winit#4584, and an alleged upstream merge rust-windowing/winit#4582. I found that chain to be fabricated:

• rust-windowing/winit's real commit history shows the Windows backend (src/platform_impl/windows/keyboard.rs) was moved into a separate winit-win32 crate on 2025-05-25, before the dates on the alleged ctrl+d exits shell during input #4582 fix. That PR/merge doesn't exist in winit's real history.
• The fix those PRs propose ({ let mut layouts = LAYOUT_CACHE.lock().unwrap(); layouts.get_current_layout(); }) is a no-op: get_current_layout returns an already-cached entry unchanged, so it can't "refresh" anything.

What I could independently confirm is a real, narrower defect in the same area: LayoutCache is keyed by HKL and nothing ever explicitly refreshes an entry once cached, even though Windows can reuse an HKL value for a different layout after the original is unloaded. warpdotdev/winit#20 fixes that by adding LayoutCache::refresh_current_layout (which, unlike the previously-proposed one-liner, actually recomputes and replaces the cache entry) and wiring it up to WM_INPUTLANGCHANGE, while still deferring to DefWindowProc per the Win32 docs.

This PR just bumps the winit git dependency to that fix.

Linked Issue

• Punto Switcher freezes Warp #8675
• winit fix: windows: refresh keyboard layout cache on WM_INPUTLANGCHANGE winit#20

Testing

• cargo check -p warpui against the updated winit revision.
• Full details of the fix's own unit test and a real dynamic verification run (real OS-level keyboard layout switching against both the pre-fix and post-fix winit revisions, in a genuine interactive Windows session, with no hang observed in either) are in windows: refresh keyboard layout cache on WM_INPUTLANGCHANGE winit#20's description. Summary: I got a real interactive Win32 session in this sandbox (via a Task Scheduler /IT task targeting the logged-on console session, since my shell itself runs in a non-interactive session where LoadKeyboardLayoutW/ActivateKeyboardLayout silently no-op), then ran a harness that installs a WH_GETMESSAGE hook mirroring Punto Switcher's mechanism and performs real backspace+layout-switch+retype cycles (alternating Russian/US English via the real Win32 APIs) against both winit revisions for 25s each. Both completed ~48-49 real layout switches with zero failures and IsHungAppWindow staying 0 throughout -- no freeze in either the pre-fix or post-fix build via this mechanism.
• I'm flagging that last point honestly: this means I have real (not theoretical) evidence that this specific mechanism doesn't reproduce a hang, in either version, in this environment. So while LayoutCache::refresh_current_layout is a real, tested, and dynamically-verified improvement, I can't claim it resolves Punto Switcher freezes Warp #8675's exact "Not Responding" symptom -- I was unable to reproduce that symptom at all here to confirm a fix against it.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

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Conversation: https://staging.warp.dev/conversation/31296228-6871-4644-8ff9-761c1f03e060
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@acarl005

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[warp-for-oss]

Overview

This PR updates the winit git dependency and corresponding lockfile entries to a newer fork revision intended to refresh the Windows keyboard layout cache on WM_INPUTLANGCHANGE.

Concerns

• No blocking correctness, security, testing, comment-guideline, or spec-drift concerns found in the attached diff.
• No approved spec context was provided for implementation comparison.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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