I reported this issue because I once wanted to search the Emacs codebase
for a string, such as "mouse-1: some tips" on mouse hover, but couldn't
find it. Later I realized that it was automatically mapped to "mouse-2".
Emacs seems to recognize some keywords (e.g. "mouse-1", "mouse-2") at the
beginning of the string on help-echo.

Anyway, now I know what happened there.

Thanks.

Best regards,
Siyuan Chen

On Mon, Jun 17, 2024 at 3:03 AM Eli Zaretskii <eliz@gnu.org> wrote:

> tags 71598 notabug
> thanks
>
> > From: Siyuan Chen <chansey97@gmail.com>
> > Date: Mon, 17 Jun 2024 00:34:35 +0800
> >
> > 1. Open Emacs with -Q
> >
> > 2. Copy the following code to *scratch*
> >
> > ```
> > (with-current-buffer (get-buffer-create "*TestBuffer*")
> >   (let ((inhibit-read-only t))
> >     (insert (propertize "aaaa"
> >                         'mouse-face 'highlight
> >                         'follow-link t
> >                         'help-echo "mouse-2: some tips"))
> >     ))
> > ```
> >
> > 3. Put the cursor after the last parenthesis and M-x `eval-last-sexp`
> >
> > 4. M-x `switch-to-buffer` "*TestBuffer*"
> >
> > 5. Put the mouse over "aaaa".
> >
> > The Expected Behavior: shows "mouse-2: some tips".
> >
> > The Actual Behavior: shows "mouse-1: some tips".
>
> This is not a bug, but the intended behavior.  It is triggered by the
> follow-link text property and the default value of
> mouse-1-click-follows-link.  If you don't like this behavior, set
> mouse-1-click-follows-link to nil.
>