RagioGroup miscalulates label widths in horizontal mode

[grkuntzmd]

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

When long labels are used in the RagioGroup in horizontal mode, they overlap.

How to reproduce

go run .

Screenshots

Example code

package main

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

func main() {
	a := app.New()
	w := a.NewWindow("Radio Group Bug")

	rg := widget.NewRadioGroup([]string{"Easy", "Medium", "Hard", "Expert"}, func(s string) {})
	rg.Horizontal = true

	w.SetContent(rg)
	w.ShowAndRun()
}

Fyne version

2.2.3

Go compiler version

1.19.3

Operating system

Windows

Operating system version

Windows 11 Pro Version 22H2

Additional Information

No response

[grkuntzmd]

The RadioGroup Layout method is using the average minimum width of its items instead of the largest minimum width. If you have several small labels and one large label, the average minimum width will be smaller than the minimum width of the large label, causing it to overlap the next label.
This code is one possible fix:

// MinSize calculates the minimum size of a radio item.
// This is based on the contained text, the radio icon and a standard amount of padding
// between each item.
func (r *radioGroupRenderer) MinSize() fyne.Size {
	width := float32(0)
	height := float32(0)
	maxMinWidth := float32(0)
	if r.radio.Horizontal {
		for _, item := range r.items {
			itemMin := item.MinSize()
			maxMinWidth = fyne.Max(maxMinWidth, itemMin.Width)
		}
	}
	for _, item := range r.items {
		itemMin := item.MinSize()
		if r.radio.Horizontal {
			height = fyne.Max(height, itemMin.Height)
			width += maxMinWidth
			// width += itemMin.Width
		} else {
			width = fyne.Max(width, itemMin.Width)
			height += itemMin.Height
		}
	}

	return fyne.NewSize(width, height)
}

[andydotxyz]

Fixed on develop