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fix(tui): keep synchronized output active across partial flushes

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Problem: when the TUI output buffer is filled during a redraw, flushing
it to the terminal also causes `CSI ? 2026 l` to be emitted, which ends
synchronized output. This causes visible flickering with large redraws.

Solution: track whether a synchronized output is currently active, and
only emit the end sequence on the final flush.
This commit is contained in:
Riccardo Mazzarini
2026-06-02 13:03:34 +02:00
parent c18373d9b8
commit f54b4f15af
2 changed files with 67 additions and 12 deletions
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26
test/functional/terminal/tui_spec.lua
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@@ -2646,6 +2646,32 @@ describe('TUI', function()
]])
end)
it('does not split large synchronized TUI output', function()
screen:try_resize(70, 333)
retry(nil, 1000, function()
eq({ true, 330 }, { child_session:request('nvim_win_get_height', 0) })
end)
local dump = t.tmpname()
finally(function()
os.remove(dump)
end)
-- Inform the TUI that synchronized output is supported.
feed_data('\027[?2026;2$y')
poke_both_eventloop()
child_session:request('nvim_set_option_value', 'termsync', true, {})
child_session:request('nvim_buf_set_lines', 0, 0, -1, true, { ('Ꝩ'):rep(21844), 'b' })
child_session:request('nvim__screenshot', dump)
poke_both_eventloop()
local raw = assert(read_file(dump))
local _, starts = raw:gsub('\027%[%?2026h', '')
local _, ends = raw:gsub('\027%[%?2026l', '')
eq({ 1, 1 }, { starts, ends })
end)
it('draws correctly when setting title overflows #30793', function()
screen:try_resize(67, 327)
retry(nil, nil, function()