bug#21092: 25.0.50; Option `lazy-highlight-max-at-a-time' does not work

[Juri Linkov]

> The same solution could be applied to bug#21092, to add a new option
> ‘buffer’ to ‘isearch-lazy-highlight’ to lazy-highlight the whole buffer.
> Then ‘follow-mode’ should check it, and override it with buffer-local
> ‘all-windows’ only when it was ‘t’ initially.

I fixed the docstring of ‘lazy-highlight-max-at-a-time’
mentioned in the subject line, and closing this bug.

Drew, if you think we need to add a new option ‘buffer’ to
‘isearch-lazy-highlight’, then please create a separate feature request.