SetFullScreen(true) before ShowAndRun fails

[cmitsakis]

Describe the bug:

Calling w.SetFullScreen(true) before w.ShowAndRun() doesn't work. Program terminates with the the following error:

X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  12 (X_ConfigureWindow)
  Value in failed request:  0x0
  Serial number of failed request:  243
  Current serial number in output stream:  249

To Reproduce:

I can reproduce it on i3 and Xfce by running the following code:

package main

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

func main() {
	a := app.New()
	w := a.NewWindow("test")
	w.SetContent(widget.NewLabel("Hello World"))
	w.SetFullScreen(true)
	w.ShowAndRun()
}

Device (please complete the following information):

• OS: Linux
• Version: 5.13.10
• Go version: 1.17
• Fyne version: 2.0.4 and 08dae6d

[koodimetsa]

This also happens with Raspberry Pi's latest OS.

[andydotxyz]

Fixed on develop ready for testing and v2.1