fix: retry re-enabling event tap after wake if it fails

[lovestorms]

Problem

After the Mac wakes from sleep (or sometimes after locking/unlocking the screen), MKey can stop typing Vietnamese diacritics entirely. The only reliable fix without this patch is quitting and relaunching the app.

Root cause

receiveWake() in MkeyApp.swift called MKBridge.startEventTap() exactly once and silently dropped the return value:

@objc private func receiveWake(_ note: Notification) {
    _ = MKBridge.startEventTap()
}

Right after wake, AXIsProcessTrusted() can report true while macOS hasn't fully reinstated the underlying Accessibility/event-tap permission yet, so CGEventTapCreate inside startEventTap fails and returns NO. Unlike startEngine() (used at launch), which checks the return value and falls back to askForAccessibility(), receiveWake() had no retry path — so the event tap was simply never recreated until the app was relaunched.

This matches symptoms reported upstream against the shared OpenKey engine:

• Lỗi không gõ được tiếng việt trên M1 khi khóa màn hình tuyenvm/OpenKey#197 (lock screen → lose Vietnamese typing, ~1/5 times, still open)
• Thỉnh thoảng ứng dụng không hoạt động tuyenvm/OpenKey#94 (same symptom, workaround: restart app)
• fix(macOS): re-enable event tap after macOS disables it tuyenvm/OpenKey#332 (unmerged PR addressing the related kCGEventTapDisabledByTimeout recovery path, which MKEngineHook.mm already handles — this PR fixes the separate wake-time creation failure, which that one doesn't cover)

Fix

Retry startEventTap() a few times (0.5s apart, up to 5 attempts) instead of giving up after the first failure on wake:

@objc private func receiveWake(_ note: Notification) {
    wakeRetryCount = 0
    retryStartEventTapAfterWake()
}

private func retryStartEventTapAfterWake() {
    if MKBridge.startEventTap() {
        AppState.shared.accessibilityGranted = true
        return
    }
    guard wakeRetryCount < 5 else { return }
    wakeRetryCount += 1
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) { [weak self] in
        self?.retryStartEventTapAfterWake()
    }
}

Testing

• xcodegen generate + xcodebuild -project mkey.xcodeproj -scheme mkey -configuration Debug build → BUILD SUCCEEDED.
• Haven't been able to reliably reproduce the intermittent wake-time tap-creation failure to verify the retry fires in practice (it's reported as ~1 in 5 sleep/wake cycles upstream), so please treat this as a best-effort fix based on the code path analysis above rather than a confirmed repro-then-fix. Happy to adjust the retry count/interval if you have more context on how often CGEventTapCreate actually fails here.

Fix by Duc Do