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

Sometimes, calling SetContent on the same content will cause the window to slightly grow.

How to reproduce

Run the example code. Click the button a lot to watch the window grow. If it's not growing, try resizing the window a little bit and try again.

Screenshots

Example code

package main

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

func main() {
	a := app.New()
	w := a.NewWindow("grow")

	var mainContent fyne.CanvasObject
	mainContent = container.NewVBox(
		widget.NewLabel("click to grow the window"),
		widget.NewButton("grow", func() {
			w.SetContent(mainContent)
		}))

	w.SetContent(mainContent)

	w.ShowAndRun()
}

Fyne version

develop

Go compiler version

go1.24.1 linux/amd64

Operating system and version

Arch Linux

Additional Information

This bug is causing my app to slightly grow with each launch. This makes it impossible for me to build a "remember the last size and restart at the same size" feature without some funky offset stuff that doesn't always work, and in my app precision is important for that feature.