Variable: gnus-summary-gather-subject-limit
gnus-summary-gather-subject-limit is a customizable variable defined
in gnus-sum.el.gz.
Value
nil
Documentation
Maximum length of subject comparisons when gathering loose threads.
Use nil to compare full subjects. Setting this variable to a low number will help gather threads that have been corrupted by newsreaders chopping off subject lines, but it might also mean that unrelated articles that have subject that happen to begin with the same few characters will be incorrectly gathered.
If this variable is fuzzy, Gnus will use a fuzzy algorithm when
comparing subjects.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/gnus-sum.el.gz
(defcustom gnus-summary-gather-subject-limit nil
"Maximum length of subject comparisons when gathering loose threads.
Use nil to compare full subjects. Setting this variable to a low
number will help gather threads that have been corrupted by
newsreaders chopping off subject lines, but it might also mean that
unrelated articles that have subject that happen to begin with the
same few characters will be incorrectly gathered.
If this variable is `fuzzy', Gnus will use a fuzzy algorithm when
comparing subjects."
:group 'gnus-thread
:type '(choice (const :tag "off" nil)
(const fuzzy)
(sexp :menu-tag "on" t)))