Meld not working, says "pango_font_description_set_size: assertion 'size >= 0' failed"
After upgrading to openSUSE 15.0, Meld no longer works, none of the text is rendered.
The weird thing is, it doesn't work with one user but works with another. I tried resetting dconf keys for meld (using dconf-editor), but it didn't help. I also tried toying with its preferences, changing fonts, etc..., didn't help.
Meld version: 3.18.0 (also tried 3.19.0 from OBS). Desktop: KDE Plasma 5
The console output is:
2018-07-16 16:37:43,134 CRITICAL Gtk:
(meld:27693): Pango-CRITICAL **: pango_font_description_set_size: assertion 'size >= 0' failed
2018-07-16 16:37:43,134 CRITICAL Gtk:
(meld:27693): Pango-CRITICAL **: pango_font_description_set_size: assertion 'size >= 0' failed
... (a lot more of these)