Eli Zaretskii <eliz@gnu.org> writes:

>> From: npostavs@users.sourceforge.net
>> Date: Tue, 30 May 2017 19:16:29 -0400
>> Cc: 27114@debbugs.gnu.org
>> 
>> > While you click and hold the mouse in the fringe in an emacs-lisp mode
>> > buffer in Emacs 25.2, the echo area indicates "Emacs-Lisp:".
>> > (This does not happen in Emacs 24.5).
>> 
>> It happens for me in 24.5 and 24.3 as well.
>
> Seems like it started happening in Emacs 23.1.

The following diff appears to fix this bug, but I'm not sure if it
should be applied. Hopefully it helps either way.