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From: "Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Mon, 11 Jul 2022 12:52:50 -0800
Message-ID: <CAC4O8c85Wc8tas4QOxmJDENssmJLkbkcWN9-u+fmT38n3y28hA@mail.gmail.com>
Subject: [geda-user] MOSTLY SOLVED: user interface scaling on HiDPI
To: geda-user AT delorie DOT com
Content-Type: text/plain; charset="UTF-8"
Reply-To: geda-user AT delorie DOT com

Added this line:

gtk-font-name = "DejaVu Sans 22"

to (newly created file not initially present on modern mint linux
install) ~/.gtkrc-2.0

This makes all the menu, layer, route style and dialog fonts readable
which is all I care about.
The toolbar items are tiny but they never change and aren't actually
inspected so it doesn't really matter.

Thx to the answer to this:
https://unix.stackexchange.com/questions/477220/how-to-set-font-and-theme-for-gtk2-programs-from-the-command-line-on-linux

Britton