This is a formal request for a new plug-in. My original request was posted on geany users .
I am looking for a plug-in that would allow to tag/label specific text or lines. For example, I have the
following line in a plain text file
and I'd like to tag it with "editor", "text", "cross-platform", "ide". Currently I do the following:
http://www.geany.org/ (editor, text, cross-platform, ide)
As Frank L. noted in the discussion, this would be similar to Emacs' org-mode. Enrico T. suggested that Scintilla's Annotation feature  could be used for such a plug-in.
I only hope that sometime someone finds interest in implementing this. :) This request is mainly to avoid the idea getting lost in the ml archives.