Warn on unavailable fonts, fall back onto GTK default font #118
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Fixes #117
This changeset introduces a warning when drawing a graph that contains references to unavailable font families, as well as behavior to fall back onto GTK's default font. I've structured these changes into separate commits in case the fallback behavior is not wanted.
I've tested this on Ubuntu 20.04, where it works, but cannot seem to get a working installation of
xdot
on Windows to test it there, probably because I installed GTK4 according to themingw
guide, but I thinkxdot
requires GTK3 specifically? I did at least test that thegtk-font-name
property is defined and has a sane value on Windows, though.