bug#26012: 25.2; help-echo should show in echo area when point is in text

[Dmitry Gutov]

On 07.03.2017 17:10, Tom Tromey wrote:
> For me the final "t))" is given font-lock-warning-face.
> It also has this text property:
>
>    help-echo            "Hidden behind deeper element; move to another line?"
>
> ... which is very useful information!
>
> However, the only way I can see this (other than describe-char) is to
> hover over the highlighted text with the mouse.

Apparently we're supposed to customize help-at-pt-display-when-idle. But 
some modes use the newly added cursor-sensor-functions, forgoing the 
idle timer.