Thicken locked Space filter border

Ariver

2026-06-11 1bdf3fd8a05223aced3a7bf5b75a948d1afe32fc

 C1.source/Sources/Aligner/QuickSwitchSessionController.swift

@@ -5,13 +5,22 @@
@MainActor
final class QuickSwitchSessionController {
    static let overlayTitle = "Aligner Quick Switch"
    private static let closeRequestStillPresentMessage = "已发送关闭请求，但窗口仍在列表中。"
    private static let closeTargetNotFoundMessage = "没有找到这个窗口的关闭控件，已刷新列表。"
    private static let closeUnsupportedMessage = "这个窗口没有可用的关闭按钮。"
    private static let closeFailedMessage = "关闭请求没有被系统接受。"
    private static let closeVerificationRetryDelays: [TimeInterval] = [0.35, 0.70, 1.20]

    private let view = QuickSwitchRootView()
    private let snapshotLoader: any QuickSwitchSnapshotLoading
    private let screenshotProvider: any ScreenshotProviderProtocol
    private let windowActivationService: any WindowActivationServiceProtocol
    private let spaceActivationService: any SpaceActivationServiceProtocol
    private let windowCloseService: any WindowCloseServiceProtocol
    private let systemCriticalWindowDetector: any SystemCriticalWindowDetecting
    private let disableScreenshotRefresh: Bool
    private var closeConfirmationRequired: Bool
    private let onCloseConfirmationDisabled: (() -> Void)?
    private let debugOverlayWidth: CGFloat?
    private let debugKeySequence: [String]
    private let debugMouseSequence: [String]
@@ -22,7 +31,13 @@
        debugOverlayWidth: debugOverlayWidth
    )
    private var currentSnapshot: QuickSwitchSnapshot?
    private var sourceViewModel: QuickSwitchViewModel?
    private var currentViewModel: QuickSwitchViewModel?
    private var lockedSpaceFilterID: UInt64?
    private var selectionBeforeSpaceFilter: QuickSwitchSelection?
    private var lastSpaceFilterAction: String?
    private var pendingLockedSpaceUnlockSpaceID: UInt64?
    private var pendingLockedSpaceUnlockTask: Task<Void, Never>?
    private var lastSnapshotError: String?
    private var snapshotTask: Task<Void, Never>?
    private var screenshotTask: Task<Void, Never>?
@@ -40,6 +55,19 @@
    private var lastActivationWindowID: UInt32?
    private var lastActivationResult: WindowActivationResult?
    private var lastActivationError: String?
    private var lastSpaceActivationSpaceID: UInt64?
    private var lastSpaceActivationDidRequestFocus: Bool?
    private var lastSpaceActivationDisplayIdentifier: String?
    private var lastSpaceActivationPreviousCurrentSpaceID: UInt64?
    private var lastSpaceActivationError: String?
    private var lastCloseTargetKind: String?
    private var lastCloseAppGroupIndex: Int?
    private var lastCloseAppName: String?
    private var lastCloseWindowID: UInt32?
    private var lastCloseResult: WindowCloseResult?
    private var lastCloseError: String?
    private var pendingCloseVerification: PendingCloseVerification?
    private var suppressedCloseTargets: [SuppressedCloseTarget] = []
    private var lastDismissReason: DismissReason?
    private var lastSystemCriticalAction: String?
    private var lastSystemCriticalMonitorSource: String?
@@ -58,6 +86,26 @@
    private var lifecycleResidualVisibleOverlayWindows = 0
    var onSnapshotUpdated: (() -> Void)?

    private struct PendingCloseVerification {
        let request: QuickSwitchCloseRequest
        let generation: Int
        let attempt: Int
    }

    private enum SuppressedCloseTarget: Equatable {
        case app(AlignerApp)
        case window(UInt32)

        init(_ request: QuickSwitchCloseRequest) {
            switch request {
            case .app:
                self = .app(request.app)
            case .window:
                self = .window(request.windowID ?? 0)
            }
        }
    }

    init(
        snapshotLoader: any QuickSwitchSnapshotLoading = LiveQuickSwitchSnapshotLoader(),
        screenshotProvider: any ScreenshotProviderProtocol = ScreenCaptureKitScreenshotProvider(
@@ -66,8 +114,14 @@
        windowActivationService: any WindowActivationServiceProtocol = CGWindowAXWindowService(
            spaceIDsByWindowIDProvider: { _ in [:] }
        ),
        spaceActivationService: any SpaceActivationServiceProtocol = PrivateSpaceActivationService(),
        windowCloseService: any WindowCloseServiceProtocol = CGWindowAXWindowService(
            spaceIDsByWindowIDProvider: { _ in [:] }
        ),
        systemCriticalWindowDetector: any SystemCriticalWindowDetecting = CGWindowSystemCriticalWindowDetector(),
        disableScreenshotRefresh: Bool = false,
        closeConfirmationRequired: Bool = true,
        onCloseConfirmationDisabled: (() -> Void)? = nil,
        debugHoveredAppGroupIndex: Int? = nil,
        debugOverlayWidth: CGFloat? = nil,
        debugKeySequence: [String] = [],
@@ -77,8 +131,12 @@
        self.snapshotLoader = snapshotLoader
        self.screenshotProvider = screenshotProvider
        self.windowActivationService = windowActivationService
        self.spaceActivationService = spaceActivationService
        self.windowCloseService = windowCloseService
        self.systemCriticalWindowDetector = systemCriticalWindowDetector
        self.disableScreenshotRefresh = disableScreenshotRefresh
        self.closeConfirmationRequired = closeConfirmationRequired
        self.onCloseConfirmationDisabled = onCloseConfirmationDisabled
        self.debugOverlayWidth = debugOverlayWidth
        self.debugKeySequence = debugKeySequence
        self.debugMouseSequence = debugMouseSequence
@@ -107,6 +165,23 @@
        lastActivationWindowID = nil
        lastActivationResult = nil
        lastActivationError = nil
        lastSpaceActivationSpaceID = nil
        lastSpaceActivationDidRequestFocus = nil
        lastSpaceActivationDisplayIdentifier = nil
        lastSpaceActivationPreviousCurrentSpaceID = nil
        lastSpaceActivationError = nil
        lastCloseTargetKind = nil
        lastCloseAppGroupIndex = nil
        lastCloseAppName = nil
        lastCloseWindowID = nil
        lastCloseResult = nil
        lastCloseError = nil
        pendingCloseVerification = nil
        suppressedCloseTargets = []
        cancelPendingLockedSpaceUnlock()
        lockedSpaceFilterID = nil
        selectionBeforeSpaceFilter = nil
        lastSpaceFilterAction = nil
        lastDismissReason = nil
        lastSystemCriticalAction = nil
        lastSystemCriticalMonitorSource = nil
@@ -128,6 +203,22 @@
        view.onCommitSelection = { [weak self] selection, source in
            self?.commitSelection(selection, source: source)
        }
        view.onSpaceLaneClick = { [weak self] spaceID, clickCount in
            self?.handleSpaceLaneClick(spaceID, clickCount: clickCount)
        }
        view.onBackgroundClick = { [weak self] in
            self?.handleBackgroundClick() ?? false
        }
        view.setSuppressEventInput(!debugMouseSequence.isEmpty || !debugKeySequence.isEmpty)
        view.onRequestClose = { [weak self] request in
            self?.requestClose(request)
        }
        view.onCloseConfirmationDisabled = { [weak self] in
            guard let self else { return }
            self.closeConfirmationRequired = false
            self.onCloseConfirmationDisabled?()
        }
        view.setCloseConfirmationRequired(closeConfirmationRequired)
        view.apply(viewModel: nil)
        view.beginPerformanceFirstFrameMeasurement()
        coordinator.openQuickSwitch()
@@ -157,6 +248,9 @@
        snapshotTask = nil
        screenshotTask?.cancel()
        screenshotTask = nil
        cancelPendingLockedSpaceUnlock()
        pendingCloseVerification = nil
        view.clearCloseFeedback()
        invalidateSystemCriticalMonitoring()
        coordinator.closeQuickSwitch(reason: reason)
        lifecycleResidualOverlayWindows = overlayWindowCount()
@@ -201,6 +295,9 @@
            "initialSelectionWindowID": currentViewModel?.initialSelection?.windowID ?? NSNull(),
            "appShelfNames": currentViewModel?.appShelf.map(\.app.name) ?? [],
            "spaceLabels": currentViewModel?.displays.flatMap { $0.spaces.map(\.label) } ?? [],
            "spaceFilterLockedSpaceID": lockedSpaceFilterID ?? NSNull(),
            "spaceFilterActive": lockedSpaceFilterID != nil,
            "lastSpaceFilterAction": lastSpaceFilterAction ?? NSNull(),
            "overlayOpenElapsedMilliseconds": overlayOpenElapsedMilliseconds ?? NSNull(),
            "snapshotStartElapsedMilliseconds": snapshotStartElapsedMilliseconds ?? NSNull(),
            "snapshotDurationMilliseconds": snapshotDurationMilliseconds ?? NSNull(),
@@ -212,6 +309,18 @@
            "lastActivationWindowID": lastActivationWindowID ?? NSNull(),
            "lastActivationResult": lastActivationResult.map(Self.activationResultString) ?? NSNull(),
            "lastActivationError": lastActivationError ?? NSNull(),
            "lastSpaceActivationSpaceID": lastSpaceActivationSpaceID ?? NSNull(),
            "lastSpaceActivationDidRequestFocus": lastSpaceActivationDidRequestFocus ?? NSNull(),
            "lastSpaceActivationDisplayIdentifier": lastSpaceActivationDisplayIdentifier ?? NSNull(),
            "lastSpaceActivationPreviousCurrentSpaceID": lastSpaceActivationPreviousCurrentSpaceID ?? NSNull(),
            "lastSpaceActivationError": lastSpaceActivationError ?? NSNull(),
            "lastCloseTargetKind": lastCloseTargetKind ?? NSNull(),
            "lastCloseAppGroupIndex": lastCloseAppGroupIndex ?? NSNull(),
            "lastCloseAppName": lastCloseAppName ?? NSNull(),
            "lastCloseWindowID": lastCloseWindowID ?? NSNull(),
            "lastCloseResult": lastCloseResult.map(Self.closeResultString) ?? NSNull(),
            "lastCloseError": lastCloseError ?? NSNull(),
            "suppressedCloseTargetCount": suppressedCloseTargets.count,
            "lastDismissReason": lastDismissReason.map(Self.dismissReasonString) ?? NSNull(),
            "overlayLevel": Int(coordinator.currentLevel),
            "overlayMainMenuLevel": Int(CGWindowLevelForKey(.mainMenuWindow)),
@@ -264,16 +373,26 @@
        updateLifecycleWindowHighWaterMark()
    }

    private func scheduleSnapshotRefresh(for generation: Int) {
    private func scheduleSnapshotRefresh(
        for generation: Int,
        replayDebugCommands: Bool = true,
        delay: TimeInterval = 0
    ) {
        DevelopmentDiagnostics.log("quickSwitch.snapshot.schedule", [
            "generation": generation,
            "visible": isVisible
            "visible": isVisible,
            "replayDebugCommands": replayDebugCommands,
            "delayMilliseconds": Int(delay * 1_000)
        ])
        snapshotTask?.cancel()
        let loader = snapshotLoader
        let showStartTime = showStartTime
        snapshotTask = Task { [weak self] in
            guard let self, !Task.isCancelled else { return }
            if delay > 0 {
                try? await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000))
                guard !Task.isCancelled else { return }
            }

            let loadTask = Task.detached(priority: .userInitiated) {
                SnapshotLoadResult.load(using: loader, showStartTime: showStartTime)
@@ -285,12 +404,17 @@
            }

            guard !Task.isCancelled else { return }
            self.applySnapshotResult(result, generation: generation)
            self.applySnapshotResult(
                result,
                generation: generation,
                replayDebugCommands: replayDebugCommands
            )
        }
    }

    private func clearSnapshotState() {
        currentSnapshot = nil
        sourceViewModel = nil
        currentViewModel = nil
        lastSnapshotError = nil
    }
@@ -362,7 +486,11 @@
        onSnapshotUpdated?()
    }

    private func commitSelection(_ selection: QuickSwitchSelection, source: QuickSwitchCommitSource) {
    private func commitSelection(
        _ selection: QuickSwitchSelection,
        source: QuickSwitchCommitSource,
        in viewModel: QuickSwitchViewModel? = nil
    ) {
        DevelopmentDiagnostics.log("quickSwitch.activation.commit.start", [
            "source": source.rawValue,
            "appGroupIndex": selection.appGroupIndex,
@@ -374,7 +502,7 @@
        lastActivationWindowID = selection.windowID
        lastActivationError = nil

        guard let window = window(for: selection) else {
        guard let window = window(for: selection, in: viewModel ?? currentViewModel) else {
            lastActivationResult = .windowNotFound
            DevelopmentDiagnostics.log("quickSwitch.activation.commit.windowNotFound", [
                "source": source.rawValue,
@@ -432,6 +560,455 @@
        onSnapshotUpdated?()
    }

    private func handleSpaceLaneClick(_ spaceID: UInt64, clickCount: Int) {
        if clickCount >= 2 {
            if pendingLockedSpaceUnlockSpaceID == spaceID {
                cancelPendingLockedSpaceUnlock()
                activateLockedSpace(spaceID)
            } else {
                DevelopmentDiagnostics.log("quickSwitch.spaceFilter.doubleClick.ignored", [
                    "spaceID": spaceID,
                    "lockedSpaceID": lockedSpaceFilterID ?? NSNull(),
                    "pendingUnlockSpaceID": pendingLockedSpaceUnlockSpaceID ?? NSNull()
                ])
            }
            return
        }

        cancelPendingLockedSpaceUnlock()
        if lockedSpaceFilterID == spaceID {
            scheduleLockedSpaceUnlock(spaceID)
            return
        }

        applySpaceLaneSingleClick(spaceID)
    }

    private func applySpaceLaneSingleClick(_ spaceID: UInt64) {
        guard let sourceViewModel else {
            lastSpaceFilterAction = "blockedNoSourceViewModel"
            DevelopmentDiagnostics.log("quickSwitch.spaceFilter.click.blocked", [
                "spaceID": spaceID,
                "reason": "noSourceViewModel"
            ])
            onSnapshotUpdated?()
            return
        }

        if let fullscreenSelection = QuickSwitchSpaceFilterPolicy.singleFullscreenSelection(
            inSpaceID: spaceID,
            viewModel: sourceViewModel
        ) {
            lockedSpaceFilterID = nil
            selectionBeforeSpaceFilter = nil
            lastSpaceFilterAction = "activateSingleFullscreen"
            let visibleViewModel = projectedViewModel(from: sourceViewModel)
            currentViewModel = visibleViewModel
            view.applyProjected(viewModel: visibleViewModel)
            DevelopmentDiagnostics.log("quickSwitch.spaceFilter.singleFullscreenActivate", [
                "spaceID": spaceID,
                "windowID": fullscreenSelection.windowID
            ])
            commitSelection(fullscreenSelection, source: .mouse, in: sourceViewModel)
            return
        }

        let preferredSelection: QuickSwitchSelection?
        if lockedSpaceFilterID == spaceID {
            lockedSpaceFilterID = nil
            preferredSelection = selectionBeforeSpaceFilter
            selectionBeforeSpaceFilter = nil
            lastSpaceFilterAction = "unlock"
        } else {
            if lockedSpaceFilterID == nil {
                selectionBeforeSpaceFilter = view.effectiveSelectionForProjection()
                lastSpaceFilterAction = "lock"
            } else {
                lastSpaceFilterAction = "switch"
            }
            lockedSpaceFilterID = spaceID
            preferredSelection = nil
        }

        let visibleViewModel = projectedViewModel(
            from: sourceViewModel,
            preferredSelection: preferredSelection
        )
        currentViewModel = visibleViewModel
        view.applyProjected(viewModel: visibleViewModel)
        DevelopmentDiagnostics.log("quickSwitch.spaceFilter.apply", [
            "spaceID": spaceID,
            "lockedSpaceID": lockedSpaceFilterID,
            "action": lastSpaceFilterAction,
            "visibleAppCount": visibleViewModel.appShelf.count,
            "visibleWindowCount": visibleViewModel.windowCount
        ])

        if disableScreenshotRefresh {
            view.markScreenshotsNotRequested(for: visibleViewModel, reason: "disabledByLaunchOption")
            screenshotTask?.cancel()
            screenshotTask = nil
        } else {
            scheduleScreenshotRefresh(for: visibleViewModel, generation: sessionGeneration)
        }

        onSnapshotUpdated?()
    }

    @discardableResult
    private func handleBackgroundClick() -> Bool {
        guard lockedSpaceFilterID != nil else { return false }

        cancelPendingLockedSpaceUnlock()
        let unlocked = unlockSpaceFilter(action: "unlockBackground")
        DevelopmentDiagnostics.log("quickSwitch.spaceFilter.backgroundUnlock", [
            "unlocked": unlocked
        ])
        return unlocked
    }

    private func scheduleLockedSpaceUnlock(_ spaceID: UInt64) {
        pendingLockedSpaceUnlockSpaceID = spaceID
        let delay = max(0.12, NSEvent.doubleClickInterval + 0.03)
        DevelopmentDiagnostics.log("quickSwitch.spaceFilter.unlock.pending", [
            "spaceID": spaceID,
            "delay": delay
        ])

        pendingLockedSpaceUnlockTask = Task { @MainActor [weak self] in
            try? await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000))
            guard !Task.isCancelled,
                  let self,
                  self.pendingLockedSpaceUnlockSpaceID == spaceID
            else {
                return
            }

            self.pendingLockedSpaceUnlockSpaceID = nil
            self.pendingLockedSpaceUnlockTask = nil
            self.applySpaceLaneSingleClick(spaceID)
        }
    }

    private func cancelPendingLockedSpaceUnlock() {
        pendingLockedSpaceUnlockTask?.cancel()
        pendingLockedSpaceUnlockTask = nil
        pendingLockedSpaceUnlockSpaceID = nil
    }

    @discardableResult
    private func unlockSpaceFilter(action: String) -> Bool {
        guard let sourceViewModel, lockedSpaceFilterID != nil else {
            return false
        }

        lockedSpaceFilterID = nil
        let preferredSelection = selectionBeforeSpaceFilter
        selectionBeforeSpaceFilter = nil
        lastSpaceFilterAction = action

        let visibleViewModel = projectedViewModel(
            from: sourceViewModel,
            preferredSelection: preferredSelection
        )
        currentViewModel = visibleViewModel
        view.applyProjected(viewModel: visibleViewModel)

        if disableScreenshotRefresh {
            view.markScreenshotsNotRequested(for: visibleViewModel, reason: "disabledByLaunchOption")
            screenshotTask?.cancel()
            screenshotTask = nil
        } else {
            scheduleScreenshotRefresh(for: visibleViewModel, generation: sessionGeneration)
        }

        onSnapshotUpdated?()
        return true
    }

    private func activateLockedSpace(_ spaceID: UInt64) {
        guard lockedSpaceFilterID == spaceID else {
            DevelopmentDiagnostics.log("quickSwitch.spaceFilter.activateSpace.ignored", [
                "spaceID": spaceID,
                "lockedSpaceID": lockedSpaceFilterID ?? NSNull()
            ])
            return
        }

        guard let sourceViewModel else {
            lastSpaceFilterAction = "blockedNoSourceViewModel"
            DevelopmentDiagnostics.log("quickSwitch.spaceFilter.activateSpace.blocked", [
                "spaceID": spaceID,
                "reason": "noSourceViewModel"
            ])
            onSnapshotUpdated?()
            return
        }

        lockedSpaceFilterID = nil
        selectionBeforeSpaceFilter = nil
        lastSpaceFilterAction = "activateSpace"
        lastSpaceActivationSpaceID = spaceID
        lastSpaceActivationDidRequestFocus = nil
        lastSpaceActivationDisplayIdentifier = nil
        lastSpaceActivationPreviousCurrentSpaceID = nil
        lastSpaceActivationError = nil

        let visibleViewModel = projectedViewModel(from: sourceViewModel)
        currentViewModel = visibleViewModel
        view.applyProjected(viewModel: visibleViewModel)

        DevelopmentDiagnostics.log("quickSwitch.spaceFilter.activateSpace.start", [
            "spaceID": spaceID
        ])
        hide(reason: .userClosed)
        let outcome = spaceActivationService.activate(spaceID: spaceID)
        lastSpaceActivationSpaceID = outcome.targetSpaceID
        lastSpaceActivationDidRequestFocus = outcome.didRequestFocus
        lastSpaceActivationDisplayIdentifier = outcome.displayIdentifier
        lastSpaceActivationPreviousCurrentSpaceID = outcome.previousCurrentSpaceID
        lastSpaceActivationError = outcome.error
        DevelopmentDiagnostics.log("quickSwitch.spaceFilter.activateSpace.result", [
            "spaceID": outcome.targetSpaceID,
            "displayIdentifier": outcome.displayIdentifier ?? NSNull(),
            "previousCurrentSpaceID": outcome.previousCurrentSpaceID ?? NSNull(),
            "didRequestFocus": outcome.didRequestFocus,
            "error": outcome.error ?? NSNull()
        ])
        onSnapshotUpdated?()
    }

    private func requestClose(_ request: QuickSwitchCloseRequest) {
        DevelopmentDiagnostics.log("quickSwitch.close.request.start", [
            "targetKind": request.kindDescription,
            "appGroupIndex": request.appGroupIndex,
            "appName": request.appName,
            "windowID": request.windowID,
            "titleHash": DevelopmentDiagnostics.stableFingerprint(request.title),
            "titleLength": request.title.count
        ])
        lastCloseTargetKind = request.kindDescription
        lastCloseAppGroupIndex = request.appGroupIndex
        lastCloseAppName = request.appName
        lastCloseWindowID = request.windowID
        lastCloseError = nil
        pendingCloseVerification = nil
        view.showCloseProgress(for: request)

        do {
            let result: WindowCloseResult
            switch request {
            case .app:
                result = try windowCloseService.close(app: request.app)
            case .window:
                guard let window = request.window else {
                    lastCloseResult = .windowNotFound
                    suppressCloseTarget(request)
                    view.clearCloseFeedback()
                    onSnapshotUpdated?()
                    return
                }
                result = try windowCloseService.close(window: window)
            }
            lastCloseResult = result
            DevelopmentDiagnostics.log("quickSwitch.close.request.result", [
                "targetKind": request.kindDescription,
                "appGroupIndex": request.appGroupIndex,
                "appName": request.appName,
                "windowID": request.windowID,
                "result": Self.closeResultString(result)
            ])
            if result == .requested {
                suppressCloseTarget(request)
                DevelopmentDiagnostics.log("quickSwitch.close.request.refreshAfterClose", [
                    "targetKind": request.kindDescription,
                    "appGroupIndex": request.appGroupIndex,
                    "appName": request.appName,
                    "windowID": request.windowID
                ])
                pendingCloseVerification = PendingCloseVerification(
                    request: request,
                    generation: sessionGeneration,
                    attempt: 0
                )
                scheduleSnapshotRefresh(
                    for: sessionGeneration,
                    replayDebugCommands: false,
                    delay: Self.closeVerificationRetryDelays[0]
                )
            } else if result == .windowNotFound {
                suppressCloseTarget(request)
                view.clearCloseFeedback()
                DevelopmentDiagnostics.log("quickSwitch.close.request.staleTargetRemoved", [
                    "targetKind": request.kindDescription,
                    "appGroupIndex": request.appGroupIndex,
                    "appName": request.appName,
                    "windowID": request.windowID
                ])
                scheduleSnapshotRefresh(
                    for: sessionGeneration,
                    replayDebugCommands: false,
                    delay: 0.10
                )
            } else {
                view.showCloseFailure(message: closeFailureMessage(for: result), for: request)
            }
        } catch {
            let errorSummary = DevelopmentDiagnostics.errorSummaryString(error)
            lastCloseResult = .failed(errorSummary)
            lastCloseError = errorSummary
            pendingCloseVerification = nil
            view.showCloseFailure(message: Self.closeFailedMessage, for: request)
            var fields: [String: CustomStringConvertible?] = [
                "targetKind": request.kindDescription,
                "appGroupIndex": request.appGroupIndex,
                "appName": request.appName,
                "windowID": request.windowID,
                "titleHash": DevelopmentDiagnostics.stableFingerprint(request.title),
                "titleLength": request.title.count
            ]
            DevelopmentDiagnostics.errorSummaryFields(error).forEach { fields[$0.key] = $0.value }
            DevelopmentDiagnostics.log("quickSwitch.close.request.error", fields)
        }

        onSnapshotUpdated?()
    }

    private func suppressCloseTarget(_ request: QuickSwitchCloseRequest) {
        let target = SuppressedCloseTarget(request)
        if !suppressedCloseTargets.contains(target) {
            suppressedCloseTargets.append(target)
        }

        guard let sourceViewModel else { return }
        let visibleViewModel = projectedViewModel(from: sourceViewModel, preferredSelection: view.effectiveSelectionForProjection())
        self.currentViewModel = visibleViewModel
        view.applyProjected(viewModel: visibleViewModel)
        DevelopmentDiagnostics.log("quickSwitch.close.optimisticRemove", [
            "targetKind": request.kindDescription,
            "appGroupIndex": request.appGroupIndex,
            "appName": request.appName,
            "windowID": request.windowID,
            "remainingWindowCount": visibleViewModel.windowCount,
            "suppressedCloseTargetCount": suppressedCloseTargets.count
        ])
    }

    private func viewModel(
        _ viewModel: QuickSwitchViewModel,
        excluding suppressedTargets: [SuppressedCloseTarget]
    ) -> QuickSwitchViewModel {
        guard !suppressedTargets.isEmpty else { return viewModel }

        var nextGlobalIndex = 0
        let columns = viewModel.waterfallColumns.compactMap { column -> QuickSwitchWaterfallColumnViewModel? in
            let windows = column.windows.filter { card in
                !suppressedTargets.contains { target in
                    suppressedTarget(target, matches: card)
                }
            }
            guard !windows.isEmpty else { return nil }

            let reindexedWindows = windows.enumerated().map { windowIndex, card in
                defer { nextGlobalIndex += 1 }
                return QuickSwitchWindowCardViewModel(
                    appGroupIndex: column.appGroupIndex,
                    windowIndex: windowIndex,
                    globalIndex: nextGlobalIndex,
                    window: card.window,
                    primarySpaceID: card.primarySpaceID,
                    primarySpaceLabel: card.primarySpaceLabel
                )
            }

            return QuickSwitchWaterfallColumnViewModel(
                appGroupIndex: column.appGroupIndex,
                app: column.app,
                windows: reindexedWindows
            )
        }

        let columnsByAppGroupIndex = Dictionary(uniqueKeysWithValues: columns.map { ($0.appGroupIndex, $0) })
        let appShelf = viewModel.appShelf.compactMap { item -> QuickSwitchAppShelfItemViewModel? in
            guard let column = columnsByAppGroupIndex[item.appGroupIndex] else { return nil }
            return QuickSwitchAppShelfItemViewModel(
                appGroupIndex: item.appGroupIndex,
                app: item.app,
                windowCount: column.windows.count,
                primarySpaceIDs: orderedPrimarySpaceIDs(in: column.windows),
                hasMinimizedWindows: column.windows.contains { $0.window.isMinimized },
                hasFullscreenWindows: column.windows.contains { $0.window.isFullscreen }
            )
        }

        return QuickSwitchViewModel(
            displays: viewModel.displays,
            appShelf: appShelf,
            waterfallColumns: columns,
            initialSelection: initialSelection(in: columns, fallback: viewModel.initialSelection),
            lockedSpaceID: viewModel.lockedSpaceID
        )
    }

    private func projectedViewModel(
        from sourceViewModel: QuickSwitchViewModel,
        preferredSelection: QuickSwitchSelection? = nil
    ) -> QuickSwitchViewModel {
        let closeProjectedViewModel = viewModel(sourceViewModel, excluding: suppressedCloseTargets)
        return QuickSwitchSpaceFilterPolicy.projectedViewModel(
            from: closeProjectedViewModel,
            lockedSpaceID: lockedSpaceFilterID,
            preferredSelection: preferredSelection
        )
    }

    private func orderedPrimarySpaceIDs(in cards: [QuickSwitchWindowCardViewModel]) -> [UInt64] {
        var seen = Set<UInt64>()
        var result: [UInt64] = []
        for card in cards {
            guard let spaceID = card.primarySpaceID,
                  !seen.contains(spaceID)
            else {
                continue
            }
            seen.insert(spaceID)
            result.append(spaceID)
        }
        return result
    }

    private func suppressedTarget(
        _ target: SuppressedCloseTarget,
        matches card: QuickSwitchWindowCardViewModel
    ) -> Bool {
        switch target {
        case .window(let windowID):
            return card.window.id == windowID
        case .app(let app):
            return appMatches(card.window.app, app)
        }
    }

    private func initialSelection(
        in columns: [QuickSwitchWaterfallColumnViewModel],
        fallback: QuickSwitchSelection?
    ) -> QuickSwitchSelection? {
        if let fallback,
           columns.contains(where: { column in
               column.appGroupIndex == fallback.appGroupIndex
                   && column.windows.contains { $0.window.id == fallback.windowID }
           }) {
            return fallback
        }

        guard let firstCard = columns.first?.windows.first else { return nil }
        return QuickSwitchSelection(
            appGroupIndex: firstCard.appGroupIndex,
            windowIndex: firstCard.windowIndex,
            windowID: firstCard.window.id
        )
    }

    private func shouldCloseAfterActivation(_ result: WindowActivationResult?) -> Bool {
        switch result {
        case .activated, .restored, .appActivatedOnly:
@@ -441,8 +1018,11 @@
        }
    }

    private func window(for selection: QuickSwitchSelection) -> AlignerWindow? {
        currentViewModel?
    private func window(
        for selection: QuickSwitchSelection,
        in viewModel: QuickSwitchViewModel?
    ) -> AlignerWindow? {
        viewModel?
            .waterfallColumns
            .flatMap(\.windows)
            .first { card in
@@ -453,7 +1033,11 @@
            .window
    }

    private func applySnapshotResult(_ result: SnapshotLoadResult, generation: Int) {
    private func applySnapshotResult(
        _ result: SnapshotLoadResult,
        generation: Int,
        replayDebugCommands: Bool
    ) {
        guard generation == sessionGeneration, isVisible else {
            DevelopmentDiagnostics.log("quickSwitch.snapshot.drop", [
                "resultGeneration": generation,
@@ -466,15 +1050,23 @@
        switch result {
        case .success(let success):
            currentSnapshot = success.snapshot
            currentViewModel = success.viewModel
            sourceViewModel = success.viewModel
            let visibleViewModel = projectedViewModel(
                from: success.viewModel,
                preferredSelection: view.effectiveSelectionForProjection()
            )
            currentViewModel = visibleViewModel
            lastSnapshotError = nil
            snapshotStartElapsedMilliseconds = success.timing.startElapsedMilliseconds
            snapshotDurationMilliseconds = success.timing.durationMilliseconds
            snapshotRanOnMainThread = success.timing.ranOnMainThread
            view.apply(viewModel: success.viewModel)
            view.apply(viewModel: visibleViewModel)
            view.recordPerformanceFirstFrameIfNeeded()
            view.performDebugKeyboardCommands(debugKeySequence)
            view.performDebugMouseCommands(debugMouseSequence)
            if replayDebugCommands {
                view.performDebugKeyboardCommands(debugKeySequence)
                view.performDebugMouseCommands(debugMouseSequence)
            }
            verifyPendingCloseIfNeeded(in: success.viewModel)
            DevelopmentDiagnostics.log("quickSwitch.snapshot.success", [
                "generation": generation,
                "displayCount": success.viewModel.displays.count,
@@ -487,17 +1079,18 @@
            ])
            guard isVisible else { return }
            if disableScreenshotRefresh {
                view.markScreenshotsNotRequested(for: success.viewModel, reason: "disabledByLaunchOption")
                view.markScreenshotsNotRequested(for: visibleViewModel, reason: "disabledByLaunchOption")
                screenshotTask?.cancel()
                screenshotTask = nil
                DevelopmentDiagnostics.log("quickSwitch.screenshot.disabledByLaunchOption", [
                    "generation": generation
                ])
            } else {
                scheduleScreenshotRefresh(for: success.viewModel, generation: generation)
                scheduleScreenshotRefresh(for: visibleViewModel, generation: generation)
            }
        case .failure(let failure):
            currentSnapshot = nil
            sourceViewModel = nil
            currentViewModel = nil
            lastSnapshotError = failure.message
            snapshotStartElapsedMilliseconds = failure.timing.startElapsedMilliseconds
@@ -506,6 +1099,7 @@
            view.apply(viewModel: nil)
            screenshotTask?.cancel()
            screenshotTask = nil
            failPendingCloseVerificationIfNeeded(reason: "snapshotFailure")
            DevelopmentDiagnostics.log("quickSwitch.snapshot.failure", [
                "generation": generation,
                "message": failure.message,
@@ -515,6 +1109,104 @@
        }

        onSnapshotUpdated?()
    }

    private func verifyPendingCloseIfNeeded(in viewModel: QuickSwitchViewModel) {
        guard let pendingCloseVerification else { return }

        self.pendingCloseVerification = nil
        let request = pendingCloseVerification.request
        let stillPresent = closeTargetStillPresent(request, in: viewModel)
        DevelopmentDiagnostics.log("quickSwitch.close.verify", [
            "targetKind": request.kindDescription,
            "appGroupIndex": request.appGroupIndex,
            "appName": request.appName,
            "windowID": request.windowID,
            "requestedGeneration": pendingCloseVerification.generation,
            "currentGeneration": sessionGeneration,
            "attempt": pendingCloseVerification.attempt,
            "stillPresent": stillPresent
        ])

        if stillPresent {
            let nextAttempt = pendingCloseVerification.attempt + 1
            if nextAttempt < Self.closeVerificationRetryDelays.count {
                self.pendingCloseVerification = PendingCloseVerification(
                    request: request,
                    generation: sessionGeneration,
                    attempt: nextAttempt
                )
                scheduleSnapshotRefresh(
                    for: sessionGeneration,
                    replayDebugCommands: false,
                    delay: Self.closeVerificationRetryDelays[nextAttempt]
                )
            } else {
                view.showCloseFailure(message: Self.closeRequestStillPresentMessage, for: request)
            }
        } else {
            view.clearCloseFeedback()
        }
    }

    private func failPendingCloseVerificationIfNeeded(reason: String) {
        guard let pendingCloseVerification else { return }

        self.pendingCloseVerification = nil
        let request = pendingCloseVerification.request
        DevelopmentDiagnostics.log("quickSwitch.close.verify.failed", [
            "targetKind": request.kindDescription,
            "appGroupIndex": request.appGroupIndex,
            "appName": request.appName,
            "windowID": request.windowID,
            "requestedGeneration": pendingCloseVerification.generation,
            "currentGeneration": sessionGeneration,
            "reason": reason
        ])
        view.showCloseFailure(message: Self.closeFailedMessage, for: request)
    }

    private func closeFailureMessage(for result: WindowCloseResult) -> String {
        switch result {
        case .requested:
            return Self.closeRequestStillPresentMessage
        case .windowNotFound:
            return Self.closeTargetNotFoundMessage
        case .unsupported:
            return Self.closeUnsupportedMessage
        case .appNotFound, .failed:
            return Self.closeFailedMessage
        }
    }

    private func closeTargetStillPresent(
        _ request: QuickSwitchCloseRequest,
        in viewModel: QuickSwitchViewModel
    ) -> Bool {
        switch request {
        case .window:
            guard let windowID = request.windowID else { return false }
            return viewModel.waterfallColumns
                .flatMap(\.windows)
                .contains { $0.window.id == windowID }
        case .app:
            return viewModel.appShelf.contains { appMatches($0.app, request.app) }
                || viewModel.waterfallColumns.contains { appMatches($0.app, request.app) }
        }
    }

    private func appMatches(_ candidate: AlignerApp, _ target: AlignerApp) -> Bool {
        if let candidatePID = candidate.processIdentifier,
           let targetPID = target.processIdentifier {
            return candidatePID == targetPID
        }

        if !candidate.bundleIdentifier.isEmpty,
           candidate.bundleIdentifier == target.bundleIdentifier {
            return true
        }

        return candidate.name == target.name
    }

    private func scheduleScreenshotRefresh(
@@ -650,6 +1342,21 @@
        }
    }

    private static func closeResultString(_ result: WindowCloseResult) -> String {
        switch result {
        case .requested:
            return "requested"
        case .windowNotFound:
            return "windowNotFound"
        case .appNotFound:
            return "appNotFound"
        case .unsupported:
            return "unsupported"
        case .failed(let message):
            return "failed(\(message))"
        }
    }

    private static func screenshotSourceString(_ source: ScreenshotResolutionSource) -> String {
        switch source {
        case .realScreenshot:
@@ -742,14 +1449,17 @@
    let snapshotLoadDelay: TimeInterval?
    let fixtureAppCount: Int?
    let fixtureWindowsPerApp: Int?
    let fixtureMultiDisplay: Bool
    let fixtureCandidateFiltering: Bool
    let fixtureActivation: Bool
    let fixtureSpaceFilter: Bool
    let debugHoveredAppGroupIndex: Int?
    let debugOverlayWidth: CGFloat?
    let debugKeySequence: [String]
    let debugMouseSequence: [String]
    let debugSystemCriticalAfter: TimeInterval?
    let debugWindowActivation: Bool
    let debugWindowClose: Bool
    let disableScreenshotRefresh: Bool
    let lifecycleCycles: Int?
    let lifecycleInterval: TimeInterval
@@ -766,14 +1476,17 @@
            snapshotLoadDelay: timeInterval(for: "--round01-snapshot-load-delay", in: arguments),
            fixtureAppCount: intValue(for: "--round01-fixture-app-count", in: arguments),
            fixtureWindowsPerApp: intValue(for: "--round01-fixture-windows-per-app", in: arguments),
            fixtureMultiDisplay: arguments.contains("--round01-fixture-multi-display"),
            fixtureCandidateFiltering: arguments.contains("--round01-fixture-candidate-filtering"),
            fixtureActivation: arguments.contains("--round01-fixture-window-activation"),
            fixtureSpaceFilter: arguments.contains("--round01-fixture-space-filter"),
            debugHoveredAppGroupIndex: intValue(for: "--round01-debug-hover-app-index", in: arguments),
            debugOverlayWidth: cgFloatValue(for: "--round01-debug-overlay-width", in: arguments),
            debugKeySequence: stringListValue(for: "--round01-debug-key-sequence", in: arguments),
            debugMouseSequence: stringListValue(for: "--round01-debug-mouse-sequence", in: arguments),
            debugSystemCriticalAfter: timeInterval(for: "--round01-debug-system-critical-after", in: arguments),
            debugWindowActivation: arguments.contains("--round01-debug-window-activation"),
            debugWindowClose: arguments.contains("--round01-debug-window-close"),
            disableScreenshotRefresh: arguments.contains("--round01-disable-screenshot-refresh"),
            lifecycleCycles: intValue(for: "--round01-quick-switch-lifecycle-cycles", in: arguments),
            lifecycleInterval: timeInterval(for: "--round01-quick-switch-lifecycle-interval", in: arguments) ?? 0.02,