bug#18343: 24.4.50; REGRESSION: `help-echo' property is not added, so no tooltip or echo

[Eli Zaretskii]

> Date: Thu, 28 Aug 2014 09:22:43 -0700 (PDT)
> From: Drew Adams <drew.adams@oracle.com>
> 
> emacs -Q
> 
> In *scratch*, evaluate this:
> 
> (add-text-properties 1 10 '(help-echo "FOOOOOOOOOOOOOOO"))
> 
> Put the mouse pointer over one of the first 10 chars.  There is no
> tooltip.  `M-x tooltip-mode', to turn it off.  Put pointer over the char
> again.  There is no echo-area echo.
> 
> `C-u C-x =' on one of the first 10 chars.  There is no `help-echo'
> property.

Disable font-lock-mode, and help-echo works again as expected.

It sounds like font-lock overwrites the help-echo property.