neovim/test/functional/legacy/visual_mode_spec.lua

-- Test visual line mode selection redraw after scrolling

local helpers = require('test.functional.helpers')(after_each)

local Screen = require('test.functional.ui.screen')
local call = helpers.call
local clear = helpers.clear
local feed = helpers.feed
local feed_command = helpers.feed_command
local funcs = helpers.funcs
local meths = helpers.meths
local eq = helpers.eq

describe('visual line mode', function()
  local screen

  it('redraws properly after scrolling with matchparen loaded and scrolloff=1', function()
    clear{args={'-u', 'NORC'}}
    screen = Screen.new(30, 7)
    screen:attach()
    screen:set_default_attr_ids({
      [1] = {bold = true},
      [2] = {background = Screen.colors.LightGrey},
    })

    eq(1, meths.get_var('loaded_matchparen'))
    feed_command('set scrolloff=1')
    funcs.setline(1, {'a', 'b', 'c', 'd', 'e', '', '{', '}', '{', 'f', 'g', '}'})
    call('cursor', 5, 1)

    feed('V<c-d><c-d>')
    screen:expect([[
      {2:{}                             |
      {2:}}                             |
      {2:{}                             |
      {2:f}                             |
      ^g                             |
      }                             |
      {1:-- VISUAL LINE --}             |
    ]])
  end)
end)