text/source view marks for spaces don't honour monospace
(with gtk+3.24.1) Problem came up in GtkSourceView widget, but given the info provided by upstream (gtksourceview#32 (closed)), problem seems to be in gtk+ or lower. Given that all 'monospace' setting seems to do is setting the font-family to 'monospace', this seems to redirect the problem to gtk_text_layout_get_iter_location, but it isn't clear what exactly might be going wrong here.
...yet, this just might be indirect dupe of pango#249 (closed)... If that the case, ...(filed over three years ago, few people on that team...)...
Edited by Daniel Boles