[vim/vim] conceal character of matchadd() displayed too many times (#7268)

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lacygoill

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Nov 6, 2020, 12:20:11 PM11/6/20

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Describe the bug

Sometimes, the conceal character used in a match installed by matchadd() is displayed too many times.

To Reproduce

Run this shell command:

vim -Nu NONE -S <(cat <<'EOF'
    let lines =<< trim END
        aaa|bbb|ccc
        aaa|bbb|ccc
        aaa|bbb|ccc
    END
    call setline(1, lines)
    call matchadd('Conceal', '^..', 10, -1, #{conceal: 'X'})
    syn match foobar '^.'
    setl cocu=n cole=1
EOF
)

The conceal character X is displayed twice.

Expected behavior

The conceal character X is displayed once.

Environment

Vim version: 8.2 Included patches: 1-1962
OS: Ubuntu 16.04.7 LTS
Terminal: xterm(361)

Additional context

Regression introduced in 8.0.0672.

I found this issue while trying to conceal the middle column in a location window, when the location list has been set by an :ltag command.

syn on
let items = [#{lnum: 1, col: 1, filename: '/tmp/file', text: 'some text'}]
call setqflist([], ' ', #{items: items})
copen
call matchadd('Conceal', '|.\{-}|', 10, -1, #{conceal: '|'})
setl cocu=n cole=1

This time, the conceal character (|) is displayed 3 times, instead of once.

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Bram Moolenaar

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May 8, 2022, 4:26:02 PM5/8/22

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Closed #7268 via 9830db6.

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