(Windows 10) Fullscreen changes my display resolution when showing a dialog.

[hugorosario]

Describe the bug:

On windows 10, setting the app to fullscreen and then showing a dialog with a button click, will change my display resolution to whatever is defined in the window size.
Resolution will only be restored after killing the app or switching to another app.

To Reproduce:

Steps to reproduce the behaviour:

Set the window to fullscreen.
Create and show a dialog inside a button click function.

Example code:

func main() {
	myApp := app.New()
	myWindow := myApp.NewWindow("FullScreen Test")
	myWindow.Resize(fyne.NewSize(800, 600))
	myWindow.SetFullScreen(true)
	myWindow.SetContent(container.NewCenter(
		widget.NewButton("Show Dialog", func() {
			dialog.NewInformation("Fyne Information", "This is a fyne message dialog you got here.", myWindow).Show()
		})))
	myWindow.ShowAndRun()
}

Device (please complete the following information):

• OS: Windows 10
• Version: 20H2 build 19042.746
• Go version: 1.15.6
• Fyne version: 1.4.3

[andydotxyz]

Turns out this is not platform specific.
The code above replicates it despite the fyne_demo doing the same thing and not showing this issue.

[hugorosario]

I tested this with the fyne_demo in fullscreen mode and also have this issue and not only with dialogs, I just need to change to another section of the demo to replicate this.

[andydotxyz]

I think I have found a patch. It's not going to make v2.0.0, but if you could test this locally we could get it in 2.0.1 and possibly back-port to 1.4.x.
winfull.diff.txt

[andydotxyz]

(FYI this seems to only happen when the dialog is larger than the window content, so it may go away if your application has more content)

[hugorosario]

I think I have found a patch. It's not going to make v2.0.0, but if you could test this locally we could get it in 2.0.1 and possibly back-port to 1.4.x.
winfull.diff.txt

Applied that patch to my package sources and it worked great.
Backporting this into the 1.4.x branch would be great.

Thank you.

[stanislav-janu]

I have same problem on MacOS and Raspbian... If I click button, then screen resolution has been changed.

fyne 2.0.0

code:

package main

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

func main() {
	app := app.New()
	window := app.NewWindow("Inventura alkoholu")
	window.Resize(fyne.Size{Width: 800, Height: 480})
	window.SetFullScreen(true)

	var i = 0
	label := widget.NewLabel("Test")
	button := widget.NewButton("Test", func() {
		i++
		label.SetText(fmt.Sprintf("kliknuto %dx", i))
	})

	splitView := container.NewVSplit(label, button)
	window.SetContent(splitView)

	window.ShowAndRun()
}

[gmaisto]

Same here with fyne 2.0.3 on Windows 10. Dialogs from a fullscreen window change the screen resolution.

[andydotxyz]

Wow, this slipped through the cracks somehow. The fix will be in v2.0.4 and v2.1.0

[andydotxyz]

Available for testing on develop and release/v2.0.x branches.