Inconsistent font sizes on high DPI system

[alexforencich]

System:

• Nheko version: 0.5.4-6744e4e
• Installation method: AUR package nheko
• Operating System: Arch Linux
• Qt version: 5.11.1-2
• C++ compiler:
• Desktop Environment: xfce

Actual behavior

Main message window and menu font very very small, system tray menu and settings fonts reasonable size with scale set on 1. Setting scale to 1.5 makes message window font reasonable, but settings and tray menu fonts WAY too big.

Maybe this has something to do with inconsistent handling of the system DPI setting. The system DPI setting is 144, set in the Appearance dialog.

Expected behavior

Consistent font size between message window and settings page, menus, etc.

Steps to reproduce

Visible immediately on starting nheko