Add horizontal waterfall arrow focus

Ariver

2026-06-19 b1368b6a51379714958af82cb1e3dc24183b0583

 C1.source/Sources/Aligner/QuickSwitchSessionController.swift

@@ -86,7 +86,7 @@
    private var lifecycleResidualOverlayWindows = 0
    private var lifecycleResidualVisibleOverlayWindows = 0
    var onSnapshotUpdated: (() -> Void)?
    var onOpenSettings: (() -> Void)?
    var onToggleWaterfallViewMode: (() -> Void)?

    private struct PendingCloseVerification {
        let request: QuickSwitchCloseRequest
@@ -213,8 +213,8 @@
        view.onBackgroundClick = { [weak self] in
            self?.handleBackgroundClick() ?? false
        }
        view.onOpenSettings = { [weak self] in
            self?.onOpenSettings?()
        view.onToggleWaterfallViewMode = { [weak self] in
            self?.onToggleWaterfallViewMode?()
        }
        view.setSuppressEventInput(!debugMouseSequence.isEmpty || !debugKeySequence.isEmpty)
        view.onRequestClose = { [weak self] request in
@@ -280,7 +280,27 @@

    func retriggerFromShortcut() {
        DevelopmentDiagnostics.log("quickSwitch.session.retriggerFromShortcut")
        show()
        guard isVisible else {
            show()
            return
        }

        guard currentViewModel != nil else {
            DevelopmentDiagnostics.log("quickSwitch.session.retriggerFromShortcut.noSnapshot", [
                "action": "fallbackShow"
            ])
            show()
            return
        }

        let didCycle = view.hoverNextAppGroupIndex()
        DevelopmentDiagnostics.log("quickSwitch.session.retriggerFromShortcut.hoverApp", [
            "didCycle": didCycle
        ])

        if !didCycle {
            show()
        }
    }

    func setWaterfallViewMode(_ mode: QuickSwitchWaterfallViewMode) {
@@ -1479,6 +1499,7 @@
    let fixtureActivation: Bool
    let fixtureSpaceFilter: Bool
    let fixtureSplitView: Bool
    let fixtureMultiPageIdentity: Bool
    let debugHoveredAppGroupIndex: Int?
    let debugOverlayWidth: CGFloat?
    let debugKeySequence: [String]
@@ -1508,6 +1529,7 @@
            fixtureActivation: arguments.contains("--round01-fixture-window-activation"),
            fixtureSpaceFilter: arguments.contains("--round01-fixture-space-filter"),
            fixtureSplitView: arguments.contains("--round01-fixture-split-view"),
            fixtureMultiPageIdentity: arguments.contains("--round01-fixture-multi-page-identity"),
            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),