Many programs output information in the format

filename:line_number:text

and so it's great that the external tools link parser can parse this and generate links.  Unfortunately, it fails to generate a link if the text does not begin with whitespace.

To see this, create an external tool which runs this command:

grep -R -n sort /path/to/gedit/sources --include='*.c'

In the output, most lines get linkified, but lines without leading whitespace don't, e.g.

/path/to/gedit/sources/gedit-window.c:1011:get_languages_sorted_by_section (GeditWindow *window)