[ComboBox]OnCurrentIndexChanged：连续触发三次

[speauty]

最近遇到个小问题，在使用ComboBox组件，由于需要获取当前选中项，然后就注册了OnCurrentIndexChanged函数。不过实际情况和预期有点小差别，那个函数被连续触发了三次，是因为某些属性未正确设置的原因么？相关源码如下：

package main

import (
	"fmt"
	"github.com/lxn/walk"
	. "github.com/lxn/walk/declarative"
	"time"
)

func main() {
	var win *walk.MainWindow
	MainWindow{
		AssignTo: &win,
		Title:    "ComboBox",
		MinSize:  Size{600, 400},
		Layout:   VBox{},
		Children: []Widget{
			ComboBox{
				Model: []string{"Combo", "Box", "CB"},
				OnCurrentIndexChanged: func() {
					fmt.Println(time.Now().String())
					// 2023-03-26 15:10:09.3184992 +0800 CST m=+2.503204401
					// 2023-03-26 15:10:09.3393394 +0800 CST m=+2.524044601
					// 2023-03-26 15:10:09.340897 +0800 CST m=+2.525602201
				},
			},
		},
	}.Run()
}

其中walk库的相关信息 github.com/lxn/walk v0.0.0-20210112085537-c389da54e794