Re: [h-e-w] strange behavior of emacs during search

> From: Bostjan Vilfan <[email protected]>
> Date: Sat, 20 Jul 2019 14:50:14 +0200
> 
> Thanks for your reply. Here are the answers to your questions: C-h l results in C-down-mouse-3- on the
> message line; the emacs version is 26.2 ; emacs -Q results in the same behavior ( C-down-mouse-3- ) on
> the message line. By the way in trying to reproduce the problem when answering your post I noticed I had to
> provide a lot  more inputs before the Edit menu appeared. Another observation: I am not even 100% sure that
> emacs is the culprit; namely, in this situation (use of internal screen) I sometimes get erratic movements of
> the cursor during which some part of the text gets changed; this type of behavior was observed at least in one
> other situations (during the reading of mail in the Firefox window).

I suspect some software unrelated to Emacs is installed on your laptop
which kicks in after several C-s keypresses.  Otherwise, I see no way
of explaining how did C-down-mouse-3- appear.