[Minor]: The close button doesn't actually close the about window

[lgbaldoni]

As per subject.

Using openSUSE Tumbleweed

[JamiKettunen]

+1, this is still an issue with https://flathub.org/apps/vn.hoabinh.quan.CoBang v0.10.1 (on Void Linux with i3wm)

[hongquan]

Hi @JamiKettunen I cannot reproduce it on Ubuntu 23.04, with Flatpak CoBang. In my environment, the "About" dialog doesn't have "Close" button.

[hongquan]

Maybe this is a compatibility issue with the environments without full DE. Because with DE (like GNOME), the dialog has "close" button in window decoration instead.