Change scaling on Gtk Qt apps

In short, add to your dotfiles exports file:

# HiDPI for GTK+ apps
export GDK_SCALE=2
export GDK_DPI_SCALE=0.5
# HiDPI for QT
export QT_DEVICE_PIXEL_RATIO=2

• see this SO Q&A
• GNOME blog: "HiDPI Support in GNOME"
  • associated docs
• Wikipedia: list of GTK+ applications