macos: add support for middle-click tab close

macos/Sources/Features/Terminal/Window Styles/TerminalWindow.swift

@@ -840,3 +840,29 @@ extension TerminalWindow: TabTitleEditorDelegate {
         makeFirstResponder(focusedSurface)
     }
 }
+
+// MARK: - Tab Clicks
+
+extension TerminalWindow {
+    /// Handles a middle-click event to close the tab under the cursor
+    ///
+    /// Returns true if the event was handled and should be consumed
+    func handleTabBarMiddleClick(_ event: NSEvent) -> Bool {
+        // Require middle click
+        guard event.type == .otherMouseDown && event.buttonNumber == 2 else { return false }
+
+        // Require tab hit
+        let screenPoint = convertPoint(toScreen: event.locationInWindow)
+        guard let hit = tabButtonHit(atScreenPoint: screenPoint) else { return false }
+
+        // Require we have tabs and the index is valid
+        guard let tabbedWindows = tabbedWindows,
+              hit.index < tabbedWindows.count else { return false }
+
+        // Find the controller and close it
+        let targetWindow = tabbedWindows[hit.index]
+        guard let controller = targetWindow.windowController as? TerminalController else { return false }
+        controller.closeTab(nil)
+        return true
+    }
+}

macos/Sources/Features/Terminal/Window Styles/TitlebarTabsTahoeTerminalWindow.swift

@@ -76,6 +76,9 @@ class TitlebarTabsTahoeTerminalWindow: TransparentTitlebarTerminalWindow, NSTool
             return
         }
 
+        // Handle middle-click to close tabs if configured
+        if handleTabBarMiddleClick(event) { return }
+
         let isRightClick =
             event.type == .rightMouseDown ||
             (event.type == .otherMouseDown && event.buttonNumber == 2) ||

macos/Sources/Features/Terminal/Window Styles/TitlebarTabsVenturaTerminalWindow.swift

@@ -69,6 +69,11 @@ class TitlebarTabsVenturaTerminalWindow: TerminalWindow {
         tab.attributedTitle = attributedTitle
     }
 
+    override func sendEvent(_ event: NSEvent) {
+        if tabBarView != nil && handleTabBarMiddleClick(event) { return }
+        super.sendEvent(event)
+    }
+
 	override func layoutIfNeeded() {
 		super.layoutIfNeeded()