Linux (ubuntu) menu shortcuts not working

[pneumaticdeath]

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

My code has working menu shortcuts on MacOS, but the same shortcuts don't work on Linux (with a different modifier key)

How to reproduce

Create a simple menu item with a shortcut

Screenshots

No response

Example code

package main

import (
	"runtime"

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

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

	text := widget.NewLabel("Hello")
	w.SetContent(text)

	var modKey fyne.KeyModifier = fyne.KeyModifierControl
	if runtime.GOOS == "darwin" {
                modKey = fyne.KeyModifierSuper
	}

	item := fyne.NewMenuItem("Test", func() {
		text.SetText("World!")
	})
	item.Shortcut = &desktop.CustomShortcut{KeyName: fyne.KeyT, Modifier: modKey}

	menu := fyne.NewMenu("Menu", item)

	w.SetMainMenu(fyne.NewMainMenu(menu))

	w.ShowAndRun()
}

Fyne version

2.5.3

Go compiler version

go version go1.23.4 darwin/arm64 and go version go1.23.4 linux/amd64

Operating system and version

macOS Sonoma and Ubuntu 24.04.1 LTS

Additional Information

Works on macOS, not on linux

[andydotxyz]

Good catch. macOS does this for us, we need to code it in for the other systems I think...

[andydotxyz]

Marking for "F" release as this will be a change due to the way that it will skip canvas shortcuts if the menu activates instead...

[andydotxyz]

Also relates to #2627