bug#14013: 24.3.50; dired-isearch-filenames-regexp is matching text outside filenames

[Juri Linkov]

> I quickly tested it.  But it doesn't yet do the right thing.  For the
> first search hit, it does - but if you repeat searching (by repeatedly
> hitting C-M-s), the behavior is like it is now - i.e., with repeated
> searching, there is no progress.

It doesn't work for `C-M-s' because by default the search in Dired
is not restricted to filenames (the default value of `dired-isearch-filenames'
is "No restrictions").  You have to start Isearch either by running
`M-x dired-isearch-filenames-regexp' or by customizing `dired-isearch-filenames'
to "Always search in file names" and then starting Isearch with `C-M-s'.

> Do you need to run `isearch-search-fun-pre-hook' at other places as well?

The patch is complete and it's working in my tests for ".*" and ".+".