On Thu, 29 Apr 2021 at 00:11, Juri Linkov <juri@linkov.net> wrote:

> The value of isearch-regexp is not saved as a property in the history.

But it should, right?

> Please elaborate.  Do you rebind C-s to isearch-forward-regexp,
> then after using isearch-forward-symbol, can't repeat it with C-s?

Exactly.

> Does something like this do the right thing for you?
>
>   (defvaralias 'regexp-search-ring 'search-ring)

Yes, I guess that would solve the problem I described, except that
isearch-regexp won't be set correctly.

Now, I'm not sure if a unified history is an interesting enough
feature to add.

But in the meanwhile something else occurred to me: `C-s C-s` is
equivalent to `C-s M-p'.  So how about making `C-s C-s' resume the
last search, event if it was canceled on in a different mode?

I have attached a patch sketching this.  What do you think?