bug#22700: 25.0.91; `erc-echo-timestamps' no longer echoes timestamp for each line

[Stefan Monnier]

>> On the Emacs 25 pretests, `erc-echo-timestamp' no longer displays a
>> timestamp in the echo area when placing point next to each line in a
>> buffer. Now the timestamps only appear for the first and last line of
>> the buffer. This might be related to the new `cursor-sensor-mode'
>> functionality replacing the old implementation, but I am not sure.
> Stefan, this seems to be a change you did, and it doesn't seem to work
> well.  When you move from the final position in the buffer, erc will
> flash a timestamp in the echo area.  But then it never triggers again,
> so somethings' off in the cursor-sensor-mode area...

Can you give a step-by-step way to reproduce this problem (for someone
like me who doesn't use ERC)?


        Stefan