bug#31790: 27.0; Mention Isearch key bindings of Isedarch variables that are bound by default in Isearch

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> `C-h v isearch(-regexp)-lax-whitespace' tells you that command
> `isearch-toggle-lax-whitespace' toggles the variable.  But it does not
> tell you that this command is bound, by default, to `M-s SPC' during
> Isearch.
>
> It should tell you that.  (It is not so easy to discover the binding.)

Now done in Emacs 28.

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