clean monitor onDisappear

Author: myaumura

CodeEdit/Features/Editor/TabBar/Tabs/Tab/EditorTabView.swift

@@ -45,6 +45,8 @@ struct EditorTabView: View {
     ///
     /// By default, this value is `false`. When the root view is appeared, it turns `true`.
     @State private var isAppeared: Bool = false
+    
+    @State private var keyMonitor: Any?
 
     /// The id associating with the tab that is currently being dragged.
     ///
@@ -194,7 +196,7 @@ struct EditorTabView: View {
             }
         }
         .onAppear {
-            NSEvent.addLocalMonitorForEvents(matching: .otherMouseDown) { event in
+            keyMonitor = NSEvent.addLocalMonitorForEvents(matching: .otherMouseDown) { event in
                 if self.isHovering && event.type == .otherMouseDown && event.buttonNumber == 2 {
                     DispatchQueue.main.async {
                         editor.closeTab(file: tabFile)
@@ -203,6 +205,12 @@ struct EditorTabView: View {
                 return event
             }
         }
+        .onDisappear {
+            if let keyMonitor = keyMonitor {
+                NSEvent.removeMonitor(keyMonitor)
+                self.keyMonitor = nil
+            }
+        }
     }
 
     var body: some View {