Custom shortcuts with fyne.KeyTab is not working

[Jacalz]

Describe the bug:

I have noticed that using fyne.KeyTab doesn't work when using the desktop.CustomShortcut type. My idea is that something with our handling of tabs is treating the window canvas as not accepting tabs. Other buttons seem to be working fine on my end.

To Reproduce:

Steps to reproduce the behaviour:

1. Run the example code below.
2. Press Ctrl + Tab on keyboard.
3. Notice that nothing happens.
4. Press Ctrl + Space on keyboard.
5. Notice that it works.

Example code:

package main

import (
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/driver/desktop"
)

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

	ctrlTab := &desktop.CustomShortcut{KeyName: fyne.KeyTab, Modifier: fyne.KeyModifierControl}
	w.Canvas().AddShortcut(ctrlTab, func(shortcut fyne.Shortcut) {
		println("We tapped Ctrl+Tab")
	})

	ctrlSpace := &desktop.CustomShortcut{KeyName: fyne.KeySpace, Modifier: fyne.KeyModifierControl}
	w.Canvas().AddShortcut(ctrlSpace, func(shortcut fyne.Shortcut) {
		println("We tapped Ctrl+Space")
	})

	w.ShowAndRun()
}

Device (please complete the following information):

• OS: Fedora Linux
• Version: 35 with kernel 5.17.14
• Go version: 1.16.15
• Fyne version: 2.2.1

[edwinclement08]

Facing the same Issue.

[Jacalz]

Fixed now on develop. Thanks @edwinclement08.