Make UI scale cleanly

[joshbowyer]

Using ProtonVPN-gui on mobile Linux (Mobian, PureOS, etc) works, but most of the window is off the screen, and the upper 1/4 is empty. More clean scaling would be very useful as this will start to be used by more people

The description says this is done in GTK3, perhaps replacing a few UI bits with libhandy to make it dynamically sized?

[calexandru2018]

Hi @joshbowyer , thank you for creating this issue :)

This is actually an interesting issue, as I haven't had the possibility to test the GUI on multiple resolutions (especially on smartphone sizes). It is definitely a valid point and worth to consider since, as yourself have stated, more people would want to use it. I'll mark this as en enhancement 👍🏻