Keep extmarks as much as possible when reset hunk

[kevinhwang91]

Is your feature request related to a problem? Please describe.
reset_hunk with range (maybe total buffer content) and reset_buffer will replace range lines with lines in hunks.

Describe the solution you'd like
Find all hunks and set lines one by one in the range. Maybe can set a limited value if the hunks are Intensive in the range.

Additional context
TBH, semantic tokens of coc.nvim and nvim-ufo use a lot of extmarks, that's the reason I want to replace Gread in fugitive with reset_buffer in gitsigns.

[kevinhwang91]

function _G.resetBuffer(bufnr)
    bufnr = bufnr or vim.api.nvim_get_current_buf()
    local gs = require('gitsigns')
    local hunks = gs.get_hunks(bufnr)
    for i = #hunks, 1, -1 do
        local hunk = hunks[i]
        local added = hunk.added
        gs.reset_hunk({added.start, added.start + math.max(0, added.count - 1)})
    end
end

This script works for me, feel free to close the issue if you want.

[lewis6991]

Sorry, I really don't understand the feature you are asking for. Can you explain? I don't understand what reset_buffer is doing that you don't like.

[kevinhwang91]

nvim_buf_set_lines(0, s, e, true, {lines}) will clear extmarks from s to e. If the range has only a hunk under {hs, he}, I expect to invoke nvim_buf_set_lines(0, hs, he, true, {hunk_lines}) instead. This will keep extmarks under ranges {s, hs - 1} and {he + 1, e}.