Form submit button remains disabled after pasting text into a MultiLineEntry with custom validation

[agukrapo]

Checklist

• I have searched the issue tracker for open issues that relate to the same problem, before opening a new one.
• This issue only relates to a single bug. I will open new issues for any other problems.

Describe the bug

Pasting text into a MultiLineEntry with custom validation won't enable the submit button

How to reproduce

1. Run example code
2. Paste text into MultiLineEntry
3. Submit button still disabled

Screenshots

No response

Example code

package main

import (
	"errors"
	"fmt"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/widget"
)

func main() {
	w := app.New().NewWindow("test")
	w.Resize(fyne.NewSize(500, 100))

	txt := widget.NewMultiLineEntry()
	txt.Validator = func(s string) error {
		if s == "" {
			return errors.New("empty")
		}
		return nil
	}

	form := &widget.Form{
		OnSubmit: func() {
			fmt.Println("OnSubmit")
		},
	}
	form.Append("txt", txt)

	w.SetContent(form)
	w.ShowAndRun()
}

Fyne version

fyne.io/fyne/v2 v2.5.0

Go compiler version

go1.22.5 darwin/arm64

Operating system and version

macOS 14.5, windows 10

Additional Information

I was able to fix it with this workaround:

txt.OnChanged = func(s string) {
_ = txt.Validate()
}

[andydotxyz]

Ah yes, it seems paste is not triggering the change events

[pierrec]

Duplicate of #5058.