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fix(terminal): wrong scrollback with BufFile* autocommand (#37601)

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Problem:  Wrong terminal scrollback if BufFile* autocommand drains PTY
          output but doesn't process the pending refresh.
Solution: Refresh scrollback before refreshing screen in terminal_open()
          if scrollback has been allocated.
This commit is contained in:
zeertzjq
2026-01-28 23:32:58 +08:00
committed by GitHub
parent 75114fe7bb
commit 97d9b85bf9
3 changed files with 72 additions and 33 deletions
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42
test/functional/terminal/buffer_spec.lua
View File

@@ -773,40 +773,56 @@ describe(':terminal buffer', function()
end)
--- @param subcmd 'REP'|'REPFAST'
local function check_term_rep_20000(subcmd)
local function check_term_rep(subcmd, count)
local screen = Screen.new(50, 7)
api.nvim_set_option_value('scrollback', 30000, {})
api.nvim_create_autocmd('TermClose', { command = 'let g:did_termclose = 1' })
fn.jobstart({ testprg('shell-test'), subcmd, '20000', 'TEST' }, { term = true })
fn.jobstart({ testprg('shell-test'), subcmd, count, 'TEST' }, { term = true })
retry(nil, nil, function()
eq(1, api.nvim_get_var('did_termclose'))
end)
feed('i')
screen:expect([[
19996: TEST |
19997: TEST |
19998: TEST |
19999: TEST |
screen:expect(([[
%d: TEST{MATCH: +}|
%d: TEST{MATCH: +}|
%d: TEST{MATCH: +}|
%d: TEST{MATCH: +}|
|
[Process exited 0]^ |
{5:-- TERMINAL --} |
]])
]]):format(count - 4, count - 3, count - 2, count - 1))
local lines = api.nvim_buf_get_lines(0, 0, -1, true)
for i = 0, 19999 do
eq(('%d: TEST'):format(i), lines[i + 1])
for i = 1, count do
eq(('%d: TEST'):format(i - 1), lines[i])
end
end
it('does not drop data when job exits immediately after output #3030', function()
check_term_rep_20000('REPFAST')
api.nvim_set_option_value('scrollback', 30000, {})
check_term_rep('REPFAST', 20000)
end)
it('does not drop data when autocommands poll for events #37559', function()
api.nvim_set_option_value('scrollback', 30000, {})
api.nvim_create_autocmd('BufFilePre', { command = 'sleep 50m', nested = true })
api.nvim_create_autocmd('BufFilePost', { command = 'sleep 50m', nested = true })
api.nvim_create_autocmd('TermOpen', { command = 'sleep 50m', nested = true })
-- REP pauses 1 ms every 100 lines, so each autocommand processes some output.
check_term_rep_20000('REP')
check_term_rep('REP', 20000)
end)
describe('scrollback is correct if all output is drained by', function()
for _, event in ipairs({ 'BufFilePre', 'BufFilePost', 'TermOpen' }) do
describe(('%s autocommand that lasts for'):format(event), function()
for _, delay in ipairs({ 5, 15, 25 }) do
-- Terminal refresh delay is 10 ms.
it(('%.1f * terminal refresh delay'):format(delay / 10), function()
local cmd = ('sleep %dm'):format(delay)
api.nvim_create_autocmd(event, { command = cmd, nested = true })
check_term_rep('REPFAST', 200)
end)
end
end)
end
end)
it('handles unprintable chars', function()