color picker callback isn't called in case of dismissal

[ole108]

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

The callback provides when creating a new color picker is called when a color is chosen - great.
For the file dialogs the same callback is called with a nil value for dismissal - great.
This does not happen in the case of the color picker.

How to reproduce

1. Create a color picker with a callback function.
2. Show the color picker.
3. Hit the cancel button.
4. The callback function isn't called.

Screenshots

No response

Example code

package main

import (
	"fmt"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/dialog"
	"image/color"
)

func main() {
	fapp := app.NewWithID("app-with-unique-id")
	win := fapp.NewWindow("pick color")

	cp := dialog.NewColorPicker("", "", func(c color.Color) {
		fmt.Println("Color callback called with:", c)
		win.Close()
		fapp.Quit()
	}, win)

	cp.Show()
	win.Show()
	fapp.Run()
}

Fyne version

2.5.2

Go compiler version

1.23.2

Operating system and version

Linux 6.1.0-26-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.112-1 (2024-09-30) x86_64 GNU/Linux

Additional Information

I will be happy to fix this bug.
I have to find out how this is done at Fyne first.

[ole108]

I have created a pull request:
#5241

But the checks aren't running automatically?