GtkSourceView: find a way to match 2 empty lines
GtkSourceView: find a way(/regex) to match 2 empty lines that in dar
denote the last paragraph of a multi paragraph footnote.
https://gitlab.gnome.org/GNOME/gtksourceview/-/issues/210
https://stackoverflow.com/questions/69073101/is-it-possible-to-match-a-paragraph-followed-by-two-empty-lines-in-a-new-line-ba
https://discourse.gnome.org/t/gtksourceview-gedit-regex-matching-discrepancy-is-it-a-bug/7437/2?u=zeev_pekar
https://stackoverflow.com/questions/69005195/gtksourceview-gedit-regex-matching-discrepancy
https://gitlab.gnome.org/GNOME/gtksourceview/-/issues/215
Here is an example for Qt multiline comments highlighting (which is similar to our problem):
https://het.as.utexas.edu/HET/Software/html/richtext-syntaxhighlighter.html