need onModify event on ImageEditor

[bronze1man]

Version

3.15.3

Development Environment

mac os 14.2.1 chrome 125.0.6422.113

Current Behavior

It is very difficult to fire onModify event.
Direct call instance.toDataURL() in undoStackChanged will cause the Draw i just paint disappear. Wait 100ms seems good:

Current workaround(vm.onSave is onModify event handler) :

        instance.on('undoStackChanged',(num)=>{
            if (vm.hasLoadSuccess == false && num>0 && instance?._invoker?._undoStack?.[0]?.name!=null && instance?._invoker?._undoStack?.[0]?.name!="loadImage"){
                vm.hasLoadSuccess = true
            }
            if (vm.hasLoadSuccess){
                   setTimeout(()=>{
                      const url = instance.toDataURL()
                      vm.onSave(url)
                   },100)
            }
        })
        instance.on('redoStackChanged',(event)=>{
            if (vm.hasLoadSuccess){
                   setTimeout(()=>{
                      const url = instance.toDataURL()
                      vm.onSave(url)
                   },100)
            }
        })

Expected Behavior

instance.on('modify',(event)=>{
         const url = instance.toDataURL()
         vm.onSave(url)
}

The modify event should not include loadImage, it should fire when I can call toDataURL.