linux: wrong positioning messages windows

[gucio321]

Hi there, (referring to https://github.com/OpenDiablo2/HellSpawner/issues/216) To Reproduce

• run a following code:

func main() {
        for {
                dialog.Message("%s", "Please select a file").Titl
                time.Sleep(1 * time.Second)
        }
}

• accept first message
• take some action in terminal (click, or press any key)
• the next dialog message won't be displayed on the top. over that, it will not be placed in the center of the screen.

Screenshots

System Informations OS: Fedora Workstation 33 desktop: GNOME Shell 3.38.3