[BUG] Linux UI doesn't scale with DPI specificed in .Xresources

[mwglen]

Describe the bug
User Interface does not scale properly for HiDPI displays and doesn't respect Xorg's DPI setting. This means that text is extremely small on HiDPI displays.

To Reproduce
Run the binary on a Linux system with a HiDPI display or a system with a specified Xorg DPI.

Expected behavior
The UI scales according to DPI

Screenshots

Desktop (please complete the following information):

• OS: Arch Linux [64bit], English
• Application version: 4.4.1-3

Additional context
XMonad is being used as a window manager, but that shouldn't affect anything.

Log files
N/A

[2ndBillGates]

same

[belozer]

Ubuntu 22.04 Wayland too

[michalmielczynski]

same here, Fedora 37 Wayland

[mich2k]

Check #403

[timschneeb]

The underlying UI toolkit used for this app doesn't support HiDPI out of the box on Linux currently.
They provide a workaround by setting an environment variable with scale factors manually: https://github.com/AvaloniaUI/Avalonia/wiki/Configuring-X11-per-monitor-DPI