Shortcuts: close tab keyboard shortcut

App/Browser View/BrowserViewController.swift

@@ -597,6 +597,20 @@ class BrowserViewController: UIViewController, WKNavigationDelegate, WKUIDelegat
         }
     }
     
+    func closeTab(_ sender: Any?) {
+        if tabController.tabs.count > 1 {
+            tabController.closeTab(self.tab)
+        } else {
+            #if targetEnvironment(macCatalyst)
+            if let originWindowScene = self.view.window?.windowScene {
+                UIApplication.shared.requestSceneSessionDestruction(originWindowScene.session, options: nil) { error in
+                    print("Error when requesting scene destruction: " + error.localizedDescription)
+                }
+            }
+            #endif
+        }
+    }
+    
     func findOnPage(_ sender: Any?) {
         browserView.setFindOnPageVisible(true, animated: true)
         findOnPageController.findOnPageView.textField.becomeFirstResponder()