【fix】Convert，输入框交互问题

PDF Office/PDF Master/KMClass/Convert/Base/KMConvertBaseWindowController.swift

@@ -345,6 +345,12 @@ class KMConvertBaseWindowController: KMNBaseWindowController {
         return result
     }
     
+    override func mouseDown(with event: NSEvent) {
+        super.mouseDown(with: event)
+        
+        window?.makeFirstResponder(nil)
+    }
+    
     // MARK: - Private Methods
     
     private func _updatePreView(pageRange: KMPageRange, pageString: String = "") {