[vim/vim] Limiting the maximum number of matches in each file when searching in multiple files with :lvimgrep (Issue #20665)

[lkintact]

lkintact created an issue (vim/vim#20665)

Is your feature request about something that is currently impossible or hard to do? Please describe the problem.
I needed to know which of the files from an argument list contained a pattern. The pattern was a common word which many of the files contained much more than once, so :lvimgrep /pattern/ ## generated a very long location list that was somewhat difficult to analyze.

Describe the solution you'd like
A flag for :lvimgrep that would limit the maximum number of matches to find in each file. (I know there's :{count}lvim[grep], but that limits the total number of matches in all files).

Describe alternatives you've considered
I came up with this function and corresponding user command:

The code:

function! LoclistUniqueFilenames()
    if !empty(getloclist(0))
        let loclist = getloclist(0)
        let items = ""
        for i in loclist
            let items ..= bufname(i['bufnr']) .. "\n"
        endfor
        new
        silent 0put =items
        silent uniq 
        return 0

    else
        echo 'Location list for the current window is empty!'
        return 1
    endif
endfunction

command -nargs=0 LocListUnique call LoclistUniqueFilenames()

That solves my particular problem, but perhaps a general solution, e.g. a flag for setting n (where n is maximum number of matches to find in each file) would be better.

Vim v9.2.738.

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