bug#37496: 27.0.50; C-s failing to search

[Jean Louis]

* Eli Zaretskii <eliz@gnu.org> [2019-10-03 20:57]:
> > Date: Thu, 3 Oct 2019 20:32:12 +0200
> > From: Jean Louis <bugs@gnu.support>
> > Cc: 37496@debbugs.gnu.org
> > 
> > I could do edebug-defun on isearch-forward or C-s and then I got this
> > below:
> > 
> > Debugger entered: nil
> >   edebug--display-1(nil 0 before)
> >   edebug--display(nil 0 before)
> >   edebug-debugger(0 before nil)
> >   edebug-before(0)
> 
> What commands did you type that yielded this backtrace?

I have turned on edebug-defun on isearch-forward as that is the key
binding on C-s and then I got the above.

> > And I have observed that the isearch-forward stopped functioning after
> > doing not so many editing with C-x C-q, just few. Suddenly I got the
> > problem again.
> 
> C-x C-q in what mode?  Which command does it run?

In Dired, when I do C-x C-q it invokes dired-toggle-read-only then I
edit the file names in Dired. Sometimes after editing then I cannot
search any more.

I have observed that I could search from menu Edit - Search String
Forward, that one worked well. Only C-s did not work.