From 6f2856fa70722dad7f7c69a3addaa05ea9fd6e94 Mon Sep 17 00:00:00 2001
From: Ariver <shanghai3168@gmail.com>
Date: Fri, 19 Jun 2026 22:36:43 +0800
Subject: [PATCH] Add two-key window shortcut codes

---
 C3.tools/round1-screenshot-session-qa.sh                  |   48 ++++-
 C3.tools/round1-vertical-keyboard-app-focus-fixture-qa.sh |  148 ++++++++++++++++
 C3.tools/round1-horizontal-waterfall-fixture-qa.sh        |  149 ++++++++++++++++
 C1.source/Sources/Aligner/QuickSwitchRootView.swift       |  180 +++++++++++++++++++
 C1.source/Resources/Aligner-Info.plist                    |    4 
 5 files changed, 511 insertions(+), 18 deletions(-)

diff --git a/C1.source/Resources/Aligner-Info.plist b/C1.source/Resources/Aligner-Info.plist
index 281756c..3eafe28 100644
--- a/C1.source/Resources/Aligner-Info.plist
+++ b/C1.source/Resources/Aligner-Info.plist
@@ -17,9 +17,9 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.0.76</string>
+	<string>0.0.77</string>
 	<key>CFBundleVersion</key>
-	<string>20260619.1947</string>
+	<string>20260619.2234</string>
 	<key>LSMinimumSystemVersion</key>
 	<string>26.0</string>
 	<key>NSHighResolutionCapable</key>
diff --git a/C1.source/Sources/Aligner/QuickSwitchRootView.swift b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
index 99608f9..5fff479 100644
--- a/C1.source/Sources/Aligner/QuickSwitchRootView.swift
+++ b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
@@ -11,6 +11,7 @@
 @MainActor
 final class QuickSwitchRootView: NSView {
     private static let appShelfIndexSymbols = Array("1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ").map(String.init)
+    private static let windowIndexKeyPendingInterval: CFTimeInterval = 0.8
     private static let appShelfIndexKeyCodes: [String: UInt16] = [
         "1": 18, "2": 19, "3": 20, "4": 21, "5": 23,
         "6": 22, "7": 26, "8": 28, "9": 25, "0": 29,
@@ -85,6 +86,10 @@
     private var lastKeyboardAppIndexCommand: String?
     private var appShelfIndexKeyDownCount = 0
     private var lastAppShelfIndexKeySymbol: String?
+    private var windowIndexKeyPending: WindowIndexKeyPending?
+    private var windowIndexKeyPendingClearTask: Task<Void, Never>?
+    private var lastWindowIndexKeyCommand: String?
+    private var lastWindowIndexKeyCommitCode: String?
     private var lastBoundaryBounceAxis: String?
     private var lastBoundaryBounceDirection: String?
     private var boundaryBounceCount = 0
@@ -324,6 +329,12 @@
         let closeButton: CloseButtonLayers
     }
 
+    private struct WindowIndexKeyPending {
+        let appSymbol: String
+        let appGroupIndex: Int
+        let startedAt: CFTimeInterval
+    }
+
     private struct ProjectionLayerSnapshot {
         let layer: CALayer
         let frame: CGRect
@@ -505,6 +516,7 @@
     }
 
     override func scrollWheel(with event: NSEvent) {
+        clearWindowIndexKeyPending()
         refreshHoverTarget(at: event.locationInWindow)
 
         let dominantDelta = abs(event.scrollingDeltaX) >= abs(event.scrollingDeltaY)
@@ -560,6 +572,7 @@
 
     override func mouseMoved(with event: NSEvent) {
         guard debugHoveredAppGroupIndex == nil else { return }
+        clearWindowIndexKeyPending()
 
         let toggleHovered = viewModeToggleButtonContains(windowLocation: event.locationInWindow)
         if !toggleHovered {
@@ -586,6 +599,7 @@
 
     override func mouseExited(with event: NSEvent) {
         guard debugHoveredAppGroupIndex == nil else { return }
+        clearWindowIndexKeyPending()
         isViewModeToggleButtonHovered = false
         suppressViewModeToggleHoverPreview = false
         hoveredCloseTarget = nil
@@ -601,6 +615,7 @@
             ])
             return
         }
+        clearWindowIndexKeyPending()
 
         if handleCloseConfirmationMouseDown(at: event.locationInWindow) {
             return
@@ -920,6 +935,11 @@
             keyboardCommandsApplied = []
             lastKeyboardCommand = nil
             lastKeyboardAppIndexCommand = nil
+            appShelfIndexKeyDownCount = 0
+            lastAppShelfIndexKeySymbol = nil
+            clearWindowIndexKeyPending()
+            lastWindowIndexKeyCommand = nil
+            lastWindowIndexKeyCommitCode = nil
             lastBoundaryBounceAxis = nil
             lastBoundaryBounceDirection = nil
             boundaryBounceCount = 0
@@ -1350,6 +1370,10 @@
             "lastKeyboardAppIndexCommand": lastKeyboardAppIndexCommand ?? NSNull(),
             "appShelfIndexKeyDownCount": appShelfIndexKeyDownCount,
             "lastAppShelfIndexKeySymbol": lastAppShelfIndexKeySymbol ?? NSNull(),
+            "windowIndexKeyPendingAppGroupIndex": windowIndexKeyPending?.appGroupIndex ?? NSNull(),
+            "windowIndexKeyPendingAppSymbol": windowIndexKeyPending?.appSymbol ?? NSNull(),
+            "lastWindowIndexKeyCommand": lastWindowIndexKeyCommand ?? NSNull(),
+            "lastWindowIndexKeyCommitCode": lastWindowIndexKeyCommitCode ?? NSNull(),
             "lastBoundaryBounceAxis": lastBoundaryBounceAxis ?? NSNull(),
             "lastBoundaryBounceDirection": lastBoundaryBounceDirection ?? NSNull(),
             "boundaryBounceCount": boundaryBounceCount,
@@ -1429,6 +1453,7 @@
         if let indexSymbol = appShelfIndexSymbol(fromKeyboardCommand: command) {
             let recordedCommand = "app:\(indexSymbol)"
             recordKeyboardCommand(recordedCommand)
+            clearWindowIndexKeyPending()
             if !focusAppShelfItemForKeyboard(indexSymbol: indexSymbol, commandLabel: recordedCommand) {
                 selectionChangedByLastCommand = false
             }
@@ -1437,6 +1462,7 @@
 
         switch command {
         case "left":
+            clearWindowIndexKeyPending()
             recordKeyboardCommand("left")
             if isHorizontalMasonryMode {
                 moveSelection(.left)
@@ -1444,6 +1470,7 @@
                 selectionChangedByLastCommand = false
             }
         case "right":
+            clearWindowIndexKeyPending()
             recordKeyboardCommand("right")
             if isHorizontalMasonryMode {
                 moveSelection(.right)
@@ -1451,6 +1478,7 @@
                 selectionChangedByLastCommand = false
             }
         case "up":
+            clearWindowIndexKeyPending()
             recordKeyboardCommand("up")
             if isHorizontalMasonryMode {
                 moveSelection(.up)
@@ -1458,6 +1486,7 @@
                 moveVerticalSelectionWithinFocusedColumn(.up)
             }
         case "down":
+            clearWindowIndexKeyPending()
             recordKeyboardCommand("down")
             if isHorizontalMasonryMode {
                 moveSelection(.down)
@@ -1465,10 +1494,12 @@
                 moveVerticalSelectionWithinFocusedColumn(.down)
             }
         case "enter", "return", "commit":
+            clearWindowIndexKeyPending()
             recordKeyboardCommand("enter")
             selectionChangedByLastCommand = false
             commitCurrentSelection()
         case "tab":
+            clearWindowIndexKeyPending()
             if isHorizontalMasonryMode {
                 recordKeyboardCommand("tab")
                 moveHorizontalMasonryTabSelection()
@@ -1478,6 +1509,7 @@
                 selectionChangedByLastCommand = false
             }
         default:
+            clearWindowIndexKeyPending()
             recordKeyboardCommand("unknown:\(command)")
             selectionChangedByLastCommand = false
         }
@@ -1499,7 +1531,51 @@
 
         appShelfIndexKeyDownCount += 1
         lastAppShelfIndexKeySymbol = symbol
+        if flags.contains(.option), handleWindowIndexKey(symbol: symbol) {
+            return true
+        }
+        clearWindowIndexKeyPending()
         performKeyboardCommand(symbol)
+        return true
+    }
+
+    private func handleWindowIndexKey(symbol: String) -> Bool {
+        let now = CACurrentMediaTime()
+        if let pending = validWindowIndexKeyPending(now: now) {
+            let code = "\(pending.appSymbol)\(symbol)"
+            if let card = waterfallCard(appGroupIndex: pending.appGroupIndex, windowIndexSymbol: symbol) {
+                recordKeyboardCommand("window:\(code)")
+                lastWindowIndexKeyCommand = "window:\(code)"
+                lastWindowIndexKeyCommitCode = code
+                clearWindowIndexKeyPending()
+                commitKeyboardWindowCard(card, trigger: "windowIndexKey")
+                return true
+            }
+
+            recordKeyboardCommand("windowInvalid:\(code)")
+            lastWindowIndexKeyCommand = "windowInvalid:\(code)"
+            lastWindowIndexKeyCommitCode = nil
+            selectionChangedByLastCommand = false
+            clearWindowIndexKeyPending()
+            return true
+        }
+
+        let recordedCommand = "app:\(symbol)"
+        recordKeyboardCommand(recordedCommand)
+        lastWindowIndexKeyCommand = nil
+        lastWindowIndexKeyCommitCode = nil
+        if focusAppShelfItemForKeyboard(indexSymbol: symbol, commandLabel: recordedCommand),
+           let ordinal = Self.appShelfIndexSymbols.firstIndex(of: symbol),
+           ordinal < appShelfItems.count {
+            setWindowIndexKeyPending(
+                appSymbol: symbol,
+                appGroupIndex: appShelfItems[ordinal].item.appGroupIndex,
+                startedAt: now
+            )
+        } else {
+            selectionChangedByLastCommand = false
+            clearWindowIndexKeyPending()
+        }
         return true
     }
 
@@ -1528,6 +1604,47 @@
             appGroupIndex: appShelfItems[ordinal].item.appGroupIndex,
             appIndexCommand: commandLabel
         )
+    }
+
+    private func validWindowIndexKeyPending(now: CFTimeInterval) -> WindowIndexKeyPending? {
+        guard let pending = windowIndexKeyPending else { return nil }
+        guard now - pending.startedAt <= Self.windowIndexKeyPendingInterval else {
+            clearWindowIndexKeyPending()
+            return nil
+        }
+        return pending
+    }
+
+    private func setWindowIndexKeyPending(appSymbol: String, appGroupIndex: Int, startedAt: CFTimeInterval) {
+        windowIndexKeyPendingClearTask?.cancel()
+        windowIndexKeyPending = WindowIndexKeyPending(
+            appSymbol: appSymbol,
+            appGroupIndex: appGroupIndex,
+            startedAt: startedAt
+        )
+        windowIndexKeyPendingClearTask = Task { @MainActor [weak self] in
+            do {
+                try await Task.sleep(nanoseconds: UInt64(Self.windowIndexKeyPendingInterval * 1_000_000_000))
+            } catch {
+                return
+            }
+            guard let self,
+                  let pending = self.windowIndexKeyPending,
+                  pending.appSymbol == appSymbol,
+                  pending.appGroupIndex == appGroupIndex,
+                  pending.startedAt == startedAt
+            else {
+                return
+            }
+            self.windowIndexKeyPending = nil
+            self.windowIndexKeyPendingClearTask = nil
+        }
+    }
+
+    private func clearWindowIndexKeyPending() {
+        windowIndexKeyPendingClearTask?.cancel()
+        windowIndexKeyPendingClearTask = nil
+        windowIndexKeyPending = nil
     }
 
     @discardableResult
@@ -1770,6 +1887,7 @@
             .trimmingCharacters(in: .whitespacesAndNewlines)
             .lowercased()
         guard !command.isEmpty else { return }
+        clearWindowIndexKeyPending()
 
         let parts = command.split(separator: ":").map(String.init)
         switch parts.first {
@@ -2078,6 +2196,34 @@
     private func clickWindowCard(_ card: WaterfallCardLayers) {
         hoverWindowCard(card)
         commitWindowCard(card, trigger: "windowCard")
+    }
+
+    private func commitKeyboardWindowCard(_ card: WaterfallCardLayers, trigger: String) {
+        let selection = QuickSwitchSelection(
+            appGroupIndex: card.item.appGroupIndex,
+            windowIndex: card.item.windowIndex,
+            windowID: card.item.window.id
+        )
+        DevelopmentDiagnostics.log("quickSwitch.view.commitKeyboardWindow", [
+            "trigger": trigger,
+            "appGroupIndex": selection.appGroupIndex,
+            "windowIndex": selection.windowIndex,
+            "windowID": selection.windowID,
+            "appName": card.item.window.app.name,
+            "appPID": card.item.window.app.processIdentifier,
+            "titleHash": DevelopmentDiagnostics.stableFingerprint(card.item.window.title),
+            "titleLength": card.item.window.title.count,
+            "titleIsEmpty": card.item.window.title.isEmpty,
+            "isMinimized": card.item.window.isMinimized,
+            "isFullscreen": card.item.window.isFullscreen,
+            "identifierSource": String(describing: card.item.window.identifierSource)
+        ])
+        currentSelection = selection
+        columnSelectionHistory[selection.appGroupIndex] = selection.windowIndex
+        lastCommittedSelection = selection
+        lastCommitSource = .keyboard
+        ensureCurrentSelectionVisible()
+        onCommitSelection?(selection, .keyboard)
     }
 
     private func commitWindowCard(_ card: WaterfallCardLayers, trigger: String) {
@@ -3305,7 +3451,8 @@
                     string: waterfallMetaText(for: window),
                     fontSize: 10,
                     weight: .regular,
-                    color: .secondaryLabelColor
+                    color: .secondaryLabelColor,
+                    alignment: .right
                 )
                 let appIcon = CALayer()
                 appIcon.contentsGravity = .resizeAspect
@@ -4101,6 +4248,15 @@
             .first(where: { $0.column.appGroupIndex == appGroupIndex })?
             .cards
             .first(where: { $0.item.windowIndex == windowIndex })
+    }
+
+    private func waterfallCard(appGroupIndex: Int, windowIndexSymbol: String) -> WaterfallCardLayers? {
+        guard let ordinal = Self.appShelfIndexSymbols.firstIndex(of: windowIndexSymbol),
+              ordinal < Self.appShelfIndexSymbols.count
+        else {
+            return nil
+        }
+        return waterfallCard(appGroupIndex: appGroupIndex, windowIndex: ordinal)
     }
 
     private func waterfallCard(windowID: UInt32) -> WaterfallCardLayers? {
@@ -5658,7 +5814,26 @@
     }
 
     private func waterfallMetaText(for card: QuickSwitchWindowCardViewModel) -> String {
-        card.primarySpaceLabel ?? "No Space"
+        windowShortcutCode(for: card) ?? ""
+    }
+
+    private func windowShortcutCode(for card: QuickSwitchWindowCardViewModel) -> String? {
+        guard let appOrdinal = appShelfItems.firstIndex(where: { $0.item.appGroupIndex == card.appGroupIndex }),
+              let appSymbol = singleIndexSymbol(forOrdinal: appOrdinal),
+              let windowSymbol = singleIndexSymbol(forOrdinal: card.windowIndex)
+        else {
+            return nil
+        }
+        return "\(appSymbol)\(windowSymbol)"
+    }
+
+    private func singleIndexSymbol(forOrdinal ordinal: Int) -> String? {
+        guard ordinal >= 0,
+              ordinal < Self.appShelfIndexSymbols.count
+        else {
+            return nil
+        }
+        return Self.appShelfIndexSymbols[ordinal]
     }
 
     private func waterfallStateText(for card: QuickSwitchWindowCardViewModel) -> String {
@@ -6178,6 +6353,7 @@
                 "titleIsEmpty": card.item.window.title.isEmpty,
                 "primarySpaceID": card.item.primarySpaceID ?? NSNull(),
                 "primarySpaceLabel": card.item.primarySpaceLabel ?? NSNull(),
+                "windowShortcutCode": waterfallMetaText(for: card.item),
                 "isMinimized": card.item.window.isMinimized,
                 "isFullscreen": card.item.window.isFullscreen,
                 "identifierSource": "\(card.item.window.identifierSource)",
diff --git a/C3.tools/round1-horizontal-waterfall-fixture-qa.sh b/C3.tools/round1-horizontal-waterfall-fixture-qa.sh
index 9a00a50..3f8ec00 100755
--- a/C3.tools/round1-horizontal-waterfall-fixture-qa.sh
+++ b/C3.tools/round1-horizontal-waterfall-fixture-qa.sh
@@ -15,6 +15,9 @@
 KEYBOARD_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-keyboard-report.json"
 APP_ENTER_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-app-enter-report.json"
 LETTER_INDEX_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-letter-index-report.json"
+WINDOW_SHORTCUT_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-window-shortcut-report.json"
+OVERFLOW_APP_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-window-shortcut-overflow-app-report.json"
+OVERFLOW_WINDOW_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-window-shortcut-overflow-window-report.json"
 ARROW_WRAP_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-arrow-wrap-report.json"
 FILTER_REPORT="$BUILD_REPORT_ROOT/round01-horizontal-waterfall-filter-report.json"
 FIXTURE_APP_COUNT="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_FIXTURE_APP_COUNT:-8}"
@@ -26,6 +29,9 @@
 LETTER_INDEX_FIXTURE_APP_COUNT="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_LETTER_INDEX_FIXTURE_APP_COUNT:-12}"
 LETTER_INDEX_KEY_SEQUENCE="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_LETTER_INDEX_KEY_SEQUENCE:-physical-index:A}"
 LETTER_INDEX_TARGET_APP_INDEX="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_LETTER_INDEX_TARGET_APP_INDEX:-10}"
+WINDOW_SHORTCUT_KEY_SEQUENCE="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_WINDOW_SHORTCUT_KEY_SEQUENCE:-physical-index:3,physical-index:6}"
+WINDOW_SHORTCUT_TARGET_APP_INDEX="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_WINDOW_SHORTCUT_TARGET_APP_INDEX:-2}"
+WINDOW_SHORTCUT_TARGET_WINDOW_INDEX="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_WINDOW_SHORTCUT_TARGET_WINDOW_INDEX:-5}"
 ARROW_WRAP_KEY_SEQUENCE="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_ARROW_WRAP_KEY_SEQUENCE:-app:1,down,up,left,down,enter}"
 REPORT_WAIT="${ALIGNER_ROUND1_HORIZONTAL_WATERFALL_REPORT_WAIT:-6.0}"
 
@@ -406,6 +412,118 @@
 PY
 }
 
+assert_window_shortcut_report() {
+  /usr/bin/python3 - "$WINDOW_SHORTCUT_REPORT" "$WINDOW_SHORTCUT_KEY_SEQUENCE" "$WINDOW_SHORTCUT_TARGET_APP_INDEX" "$WINDOW_SHORTCUT_TARGET_WINDOW_INDEX" <<'PY'
+import json
+import sys
+
+path = sys.argv[1]
+raw_key_sequence = [part for part in sys.argv[2].split(",") if part]
+target_app_index = int(sys.argv[3])
+target_window_index = int(sys.argv[4])
+
+with open(path, "r", encoding="utf-8") as file:
+    report = json.load(file)
+
+def require(condition, message):
+    if not condition:
+        print(message, file=sys.stderr)
+        print(json.dumps(report, indent=2, ensure_ascii=False), file=sys.stderr)
+        sys.exit(1)
+
+def physical_symbol(part):
+    lowered = part.lower()
+    for prefix in ("physical-index:", "physical-index-", "keydown:", "keydown-"):
+        if lowered.startswith(prefix):
+            return part[len(prefix):].strip().upper()
+    return None
+
+physical_symbols = [symbol for part in raw_key_sequence if (symbol := physical_symbol(part))]
+require(len(physical_symbols) == 2, "window shortcut test must use two physical symbols")
+expected_code = "".join(physical_symbols)
+expected_sequence = [f"app:{physical_symbols[0]}", f"window:{expected_code}"]
+
+root = report.get("rootView", {})
+columns = root.get("waterfallColumns", [])
+require(report.get("snapshotLoaded") is True, "snapshotLoaded must be true")
+require(root.get("waterfallViewMode") == "horizontalMasonry", "window shortcut run must use horizontalMasonry")
+require(root.get("keyboardCommandsApplied") == expected_sequence, "two-key window shortcut commands must be applied")
+require(root.get("appShelfIndexKeyDownCount") == 2, "two-key window shortcut must exercise two physical keyDown events")
+require(root.get("lastAppShelfIndexKeySymbol") == physical_symbols[-1], "last physical symbol must be the window index key")
+require(root.get("lastWindowIndexKeyCommand") == f"window:{expected_code}", "last window shortcut command must be reported")
+require(root.get("lastWindowIndexKeyCommitCode") == expected_code, "last window shortcut commit code must be reported")
+require(root.get("windowIndexKeyPendingAppGroupIndex") is None, "two-key commit must clear pending App")
+require(root.get("windowIndexKeyPendingAppSymbol") is None, "two-key commit must clear pending App symbol")
+require(target_app_index < len(columns), "target App index must exist")
+target_column = columns[target_app_index]
+cards = target_column.get("cards", [])
+require(target_window_index < len(cards), "target window index must exist")
+target_card = cards[target_window_index]
+require(target_card.get("windowShortcutCode") == expected_code, "target card must expose the expected two-character shortcut code")
+require(target_card.get("primarySpaceLabel") != target_card.get("windowShortcutCode"), "shortcut code must replace the old Space label in the UI meta slot")
+require(root.get("lastCommittedAppGroupIndex") == target_app_index, "two-key shortcut must commit target App")
+require(root.get("lastCommittedWindowIndex") == target_window_index, "two-key shortcut must commit target window")
+require(root.get("lastCommittedWindowID") == target_card.get("windowID"), "two-key shortcut must commit target window ID")
+require(root.get("lastCommitSource") == "keyboard", "two-key shortcut commit must be keyboard sourced")
+require(root.get("selectedAppGroupIndex") == target_app_index, "two-key shortcut must select target App")
+require(root.get("selectedWindowIndex") == target_window_index, "two-key shortcut must select target window")
+require(root.get("selectedWindowID") == target_card.get("windowID"), "two-key shortcut selection ID must match target window")
+
+for column in columns:
+    for card in column.get("cards", []):
+        code = card.get("windowShortcutCode")
+        require(code != "No Space" and code != "N...", "window shortcut code must not expose the old No Space label")
+
+print(json.dumps({
+    "commands": root.get("keyboardCommandsApplied"),
+    "code": expected_code,
+    "lastCommittedWindowID": root.get("lastCommittedWindowID")
+}, indent=2, ensure_ascii=False))
+PY
+}
+
+assert_window_shortcut_overflow_report() {
+  /usr/bin/python3 - "$OVERFLOW_APP_REPORT" "$OVERFLOW_WINDOW_REPORT" <<'PY'
+import json
+import sys
+
+app_path = sys.argv[1]
+window_path = sys.argv[2]
+
+with open(app_path, "r", encoding="utf-8") as file:
+    app_report = json.load(file)
+with open(window_path, "r", encoding="utf-8") as file:
+    window_report = json.load(file)
+
+def require(report, condition, message):
+    if not condition:
+        print(message, file=sys.stderr)
+        print(json.dumps(report, indent=2, ensure_ascii=False), file=sys.stderr)
+        sys.exit(1)
+
+app_root = app_report.get("rootView", {})
+app_columns = app_root.get("waterfallColumns", [])
+require(app_report, app_report.get("snapshotLoaded") is True, "App overflow report must be loaded")
+require(app_report, len(app_columns) == 37, "App overflow fixture must expose 37 columns")
+require(app_report, app_columns[35].get("cards", [])[0].get("windowShortcutCode") == "Z1", "36th App must still expose a shortcut code")
+require(app_report, app_columns[36].get("cards", [])[0].get("windowShortcutCode") == "", "37th App must not expose a two-key shortcut code")
+
+window_root = window_report.get("rootView", {})
+window_columns = window_root.get("waterfallColumns", [])
+require(window_report, window_report.get("snapshotLoaded") is True, "Window overflow report must be loaded")
+require(window_report, len(window_columns) == 1, "Window overflow fixture must expose one column")
+cards = window_columns[0].get("cards", [])
+require(window_report, len(cards) == 37, "Window overflow fixture must expose 37 windows")
+require(window_report, cards[35].get("windowShortcutCode") == "1Z", "36th window must still expose a shortcut code")
+require(window_report, cards[36].get("windowShortcutCode") == "", "37th window must not expose a two-key shortcut code")
+
+print(json.dumps({
+    "appOverflowCode": app_columns[36].get("cards", [])[0].get("windowShortcutCode"),
+    "windowOverflowCode": cards[36].get("windowShortcutCode")
+}, indent=2, ensure_ascii=False))
+PY
+}
+
 assert_arrow_wrap_report() {
   /usr/bin/python3 - "$ARROW_WRAP_REPORT" "$ARROW_WRAP_KEY_SEQUENCE" "$FIXTURE_APP_COUNT" <<'PY'
 import json
@@ -511,12 +629,21 @@
   local app_count="$2"
   shift 2
 
+  run_fixture_with_shape "$report" "$app_count" "$FIXTURE_WINDOWS_PER_APP" "$@"
+}
+
+run_fixture_with_shape() {
+  local report="$1"
+  local app_count="$2"
+  local windows_per_app="$3"
+  shift 3
+
   rm -f "$report"
   "$APP/Contents/MacOS/Aligner" \
     --round0-skip-permissions \
     --round01-open-quick-switch \
     --round01-fixture-app-count="$app_count" \
-    --round01-fixture-windows-per-app="$FIXTURE_WINDOWS_PER_APP" \
+    --round01-fixture-windows-per-app="$windows_per_app" \
     --round01-disable-screenshot-refresh \
     --round01-waterfall-view-mode=horizontal \
     --round01-quick-switch-report="$report" \
@@ -592,6 +719,26 @@
 wait "$APP_PID" 2>/dev/null || true
 stop_current_aligner
 
+run_fixture "$WINDOW_SHORTCUT_REPORT" --round01-debug-key-sequence="$WINDOW_SHORTCUT_KEY_SEQUENCE"
+wait_for_loaded_report "$WINDOW_SHORTCUT_REPORT"
+assert_window_shortcut_report
+kill "$APP_PID" 2>/dev/null || true
+wait "$APP_PID" 2>/dev/null || true
+stop_current_aligner
+
+run_fixture_with_shape "$OVERFLOW_APP_REPORT" 37 1
+wait_for_loaded_report "$OVERFLOW_APP_REPORT"
+kill "$APP_PID" 2>/dev/null || true
+wait "$APP_PID" 2>/dev/null || true
+stop_current_aligner
+
+run_fixture_with_shape "$OVERFLOW_WINDOW_REPORT" 1 37
+wait_for_loaded_report "$OVERFLOW_WINDOW_REPORT"
+assert_window_shortcut_overflow_report
+kill "$APP_PID" 2>/dev/null || true
+wait "$APP_PID" 2>/dev/null || true
+stop_current_aligner
+
 run_fixture "$ARROW_WRAP_REPORT" --round01-debug-key-sequence="$ARROW_WRAP_KEY_SEQUENCE"
 wait_for_loaded_report "$ARROW_WRAP_REPORT"
 assert_arrow_wrap_report
diff --git a/C3.tools/round1-screenshot-session-qa.sh b/C3.tools/round1-screenshot-session-qa.sh
index 6903a30..56700f8 100755
--- a/C3.tools/round1-screenshot-session-qa.sh
+++ b/C3.tools/round1-screenshot-session-qa.sh
@@ -118,6 +118,41 @@
 PY
 }
 
+assert_overlay_frame() {
+  local attempt
+  for attempt in {1..8}; do
+    if [ "$SKIP_OVERLAY_FRAME_CHECK" = "1" ]; then
+      if swift "$SCRIPT_DIR/window-logic-qa.swift" \
+        --expect-quick-switch \
+        --expect-single-aligner-overlay; then
+        return
+      fi
+    else
+      if swift "$SCRIPT_DIR/window-logic-qa.swift" \
+        --expect-quick-switch \
+        --expect-single-aligner-overlay \
+        --expect-overlay-on-mouse-screen \
+        --expect-overlay-uses-screen-frame; then
+        return
+      fi
+    fi
+
+    sleep 0.4
+  done
+
+  if [ "$SKIP_OVERLAY_FRAME_CHECK" = "1" ]; then
+    swift "$SCRIPT_DIR/window-logic-qa.swift" \
+      --expect-quick-switch \
+      --expect-single-aligner-overlay
+  else
+    swift "$SCRIPT_DIR/window-logic-qa.swift" \
+      --expect-quick-switch \
+      --expect-single-aligner-overlay \
+      --expect-overlay-on-mouse-screen \
+      --expect-overlay-uses-screen-frame
+  fi
+}
+
 assert_report() {
   /usr/bin/python3 - "$REPORT" "$REQUIRE_REAL_SCREENSHOT" <<'PY'
 import json
@@ -233,18 +268,7 @@
 
 sleep "$OPEN_WAIT"
 wait_for_loaded_report
-
-if [ "$SKIP_OVERLAY_FRAME_CHECK" = "1" ]; then
-  swift "$SCRIPT_DIR/window-logic-qa.swift" \
-    --expect-quick-switch \
-    --expect-single-aligner-overlay
-else
-  swift "$SCRIPT_DIR/window-logic-qa.swift" \
-    --expect-quick-switch \
-    --expect-single-aligner-overlay \
-    --expect-overlay-on-mouse-screen \
-    --expect-overlay-uses-screen-frame
-fi
+assert_overlay_frame
 
 wait_for_screenshots
 assert_report
diff --git a/C3.tools/round1-vertical-keyboard-app-focus-fixture-qa.sh b/C3.tools/round1-vertical-keyboard-app-focus-fixture-qa.sh
index 2520ff9..9a3b1a2 100755
--- a/C3.tools/round1-vertical-keyboard-app-focus-fixture-qa.sh
+++ b/C3.tools/round1-vertical-keyboard-app-focus-fixture-qa.sh
@@ -14,7 +14,7 @@
 REPORT_DIR="$BUILD_REPORT_ROOT"
 FIXTURE_APP_COUNT="${ALIGNER_ROUND1_VERTICAL_KEYBOARD_APP_COUNT:-12}"
 FIXTURE_WINDOWS_PER_APP="${ALIGNER_ROUND1_VERTICAL_KEYBOARD_WINDOWS_PER_APP:-8}"
-REPORT_WAIT="${ALIGNER_ROUND1_VERTICAL_KEYBOARD_REPORT_WAIT:-6.0}"
+REPORT_WAIT="${ALIGNER_ROUND1_VERTICAL_KEYBOARD_REPORT_WAIT:-12.0}"
 APP_PID=""
 
 fail() {
@@ -114,6 +114,45 @@
 if last_report is not None:
     print(json.dumps(last_report, indent=2, ensure_ascii=False), file=sys.stderr)
 print(f"vertical keyboard report did not reach expected commands within {timeout:.1f}s", file=sys.stderr)
+sys.exit(1)
+PY
+}
+
+wait_for_committed_report() {
+  local report="$1"
+  local expected_sequence="$2"
+
+  /usr/bin/python3 - "$report" "$REPORT_WAIT" "$expected_sequence" <<'PY'
+import json
+import sys
+import time
+
+path = sys.argv[1]
+timeout = float(sys.argv[2])
+expected_sequence = [part for part in sys.argv[3].split(",") if part]
+deadline = time.monotonic() + timeout
+last_report = None
+
+while time.monotonic() < deadline:
+    try:
+        with open(path, "r", encoding="utf-8") as file:
+            report = json.load(file)
+        last_report = report
+        root = report.get("rootView", {})
+        if (
+            report.get("snapshotLoaded") is True
+            and root.get("keyboardCommandsApplied") == expected_sequence
+        ):
+            sys.exit(0)
+    except FileNotFoundError:
+        pass
+    except json.JSONDecodeError:
+        pass
+    time.sleep(0.2)
+
+if last_report is not None:
+    print(json.dumps(last_report, indent=2, ensure_ascii=False), file=sys.stderr)
+print(f"vertical keyboard committed report did not reach expected commands within {timeout:.1f}s", file=sys.stderr)
 sys.exit(1)
 PY
 }
@@ -239,6 +278,82 @@
 PY
 }
 
+assert_window_shortcut_report() {
+  local report="$1"
+  local expected_sequence="$2"
+  local target_app_index="$3"
+  local target_window_index="$4"
+  local expected_code="$5"
+
+  /usr/bin/python3 - \
+    "$report" \
+    "$expected_sequence" \
+    "$target_app_index" \
+    "$target_window_index" \
+    "$expected_code" \
+    "$FIXTURE_APP_COUNT" \
+    "$FIXTURE_WINDOWS_PER_APP" <<'PY'
+import json
+import sys
+
+path = sys.argv[1]
+expected_sequence = [part for part in sys.argv[2].split(",") if part]
+target_app_index = int(sys.argv[3])
+target_window_index = int(sys.argv[4])
+expected_code = sys.argv[5]
+fixture_app_count = int(sys.argv[6])
+fixture_windows_per_app = int(sys.argv[7])
+
+with open(path, "r", encoding="utf-8") as file:
+    report = json.load(file)
+
+def require(condition, message):
+    if not condition:
+        print(message, file=sys.stderr)
+        print(json.dumps(report, indent=2, ensure_ascii=False), file=sys.stderr)
+        sys.exit(1)
+
+root = report.get("rootView", {})
+columns = root.get("waterfallColumns", [])
+require(report.get("snapshotLoaded") is True, "snapshotLoaded must be true")
+require(report.get("appCount") == fixture_app_count, "fixture appCount must match")
+require(report.get("windowCount") == fixture_app_count * fixture_windows_per_app, "fixture windowCount must match")
+require(root.get("waterfallViewMode") == "verticalColumns", "window shortcut fixture must run in vertical Waterfall")
+require(root.get("keyboardCommandsApplied") == expected_sequence, "two-key window shortcut commands must match")
+require(root.get("appShelfIndexKeyDownCount") == 2, "two-key window shortcut must exercise two physical keyDown events")
+require(root.get("lastAppShelfIndexKeySymbol") == expected_code[-1], "last physical symbol must be the window index key")
+require(root.get("lastWindowIndexKeyCommand") == f"window:{expected_code}", "last window shortcut command must be reported")
+require(root.get("lastWindowIndexKeyCommitCode") == expected_code, "last window shortcut commit code must be reported")
+require(root.get("windowIndexKeyPendingAppGroupIndex") is None, "two-key commit must clear pending App")
+require(root.get("windowIndexKeyPendingAppSymbol") is None, "two-key commit must clear pending App symbol")
+require(target_app_index < len(columns), "target App index must exist")
+target_column = columns[target_app_index]
+cards = target_column.get("cards", [])
+require(target_window_index < len(cards), "target window index must exist")
+target_card = cards[target_window_index]
+require(target_card.get("windowShortcutCode") == expected_code, "target card must expose expected two-character shortcut code")
+require(target_card.get("primarySpaceLabel") != target_card.get("windowShortcutCode"), "shortcut code must replace the old Space label in the UI meta slot")
+require(root.get("lastCommittedAppGroupIndex") == target_app_index, "two-key shortcut must commit target App")
+require(root.get("lastCommittedWindowIndex") == target_window_index, "two-key shortcut must commit target window")
+require(root.get("lastCommittedWindowID") == target_card.get("windowID"), "two-key shortcut must commit target window ID")
+require(root.get("lastCommitSource") == "keyboard", "two-key shortcut commit must be keyboard sourced")
+require(root.get("selectedAppGroupIndex") == target_app_index, "two-key shortcut must select target App")
+require(root.get("selectedWindowIndex") == target_window_index, "two-key shortcut must select target window")
+require(root.get("selectedWindowID") == target_card.get("windowID"), "two-key shortcut selection ID must match target window")
+
+for column in columns:
+    for card in column.get("cards", []):
+        code = card.get("windowShortcutCode")
+        require(code != "No Space" and code != "N...", "window shortcut code must not expose the old No Space label")
+
+print(json.dumps({
+    "commands": root.get("keyboardCommandsApplied"),
+    "code": expected_code,
+    "lastCommittedWindowID": root.get("lastCommittedWindowID")
+}, indent=2, ensure_ascii=False))
+PY
+}
+
 run_case() {
   local name="$1"
   local sequence="$2"
@@ -287,6 +402,36 @@
   swift "$SCRIPT_DIR/window-logic-qa.swift" --expect-no-quick-switch >&2
 }
 
+run_window_shortcut_case() {
+  local name="window-shortcut"
+  local sequence="physical-index:3,physical-index:6"
+  local expected_sequence="app:3,window:36"
+  local report="$REPORT_DIR/round01-vertical-keyboard-$name-report.json"
+
+  stop_current_aligner
+  rm -f "$report"
+
+  "$APP/Contents/MacOS/Aligner" \
+    --round0-skip-permissions \
+    --round01-open-quick-switch \
+    --round01-waterfall-view-mode=vertical \
+    --round01-fixture-app-count="$FIXTURE_APP_COUNT" \
+    --round01-fixture-windows-per-app="$FIXTURE_WINDOWS_PER_APP" \
+    --round01-disable-screenshot-refresh \
+    --round01-debug-key-sequence="$sequence" \
+    --round01-quick-switch-report="$report" &
+
+  APP_PID=$!
+  wait_for_committed_report "$report" "$expected_sequence"
+  assert_window_shortcut_report "$report" "$expected_sequence" 2 5 "36"
+
+  kill "$APP_PID" 2>/dev/null || true
+  wait "$APP_PID" 2>/dev/null || true
+  APP_PID=""
+  sleep 0.3
+  swift "$SCRIPT_DIR/window-logic-qa.swift" --expect-no-quick-switch >&2
+}
+
 if [ "$FIXTURE_APP_COUNT" -lt 12 ]; then
   fail "fixture app count must be at least 12"
 fi
@@ -310,6 +455,7 @@
 run_case "right-wrap-to-first" "$LAST_APP_SYMBOL,right" 0 0 0 0 "none" "false" "false"
 run_case "bottom-boundary" "3,down,down,down,down,down,down,down,down,down" 2 2 7 1 "down" "false" "true"
 run_case "top-boundary" "4,down,up" 3 3 0 1 "up" "false" "true"
+run_window_shortcut_case
 
 trap - EXIT
 cleanup

--
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