【综合】兼容右键事件

PDF Office/PDF Master/Class/PDFWindowController/ViewController/KMMainViewController+Action.swift

@@ -359,7 +359,11 @@ extension KMMainViewController {
     }
     
     func setLookUpStype() -> NSMenuItem {
-        let str = listView?.currentSelection?.string() ?? ""//String(format: "Look Up %@", listView?.currentSelection?.string() ?? "")
+        
+        guard let str = listView?.currentSelection?.string() else {
+            return NSMenuItem.separator()
+        }//String(format: "Look Up %@", listView?.currentSelection?.string() ?? "")
+        
         let dic = numberOfChars(str)
         
         var newStr = str