Chromium counts all the matches in the page, presented or hidden. For Emacs I don't think it is feasible to read the entire file. BTW isearch-lazy-highlight takes into consideration only the matches that are currently on screen.

Thanks, Gideon.

On , Juri Linkov <juri@jurta.org> wrote:
> > Nice idea. Let me try and tweak the patch to work in this way. I want to
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> > test it and see how it feels.
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>
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> BTW, there is another useful search feature missing in Isearch.
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>
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> In Chromium, the Search prompt displays the current search position
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> and the total number of matches. It would be useful to implement this
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> in Isearch. It helps to orient oneself while searching - to see
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> how many matches are remaining to visit with C-s, etc.
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>
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> This information could be displayed in the mode-line in the usual format
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> that can be seen in some Emacs packages, e.g. "7/24".
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> The main problem is in the performance impact to count the total
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> number of matches. Perhaps to not affect the responsiveness
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> these computations should be placed in `isearch-lazy-highlight'.
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>