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Limit the a11y live region for output without line feeds - #6199
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0x48Maciek wants to merge 1 commit into
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0x48Maciek wants to merge 1 commit into
0x48Maciek wants to merge 1 commit into
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The live region only counted line feeds towards the "too much output" limit, so output that positions the cursor instead (eg. a TUI redrawing the viewport) appended every printed character to it until the terminal lost focus or a key was pressed. A row's worth of characters now also counts as a line. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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In screen reader mode the live region stops taking output after 20 line feeds. Output that positions the cursor instead never reaches that limit, so every printed character is appended until the terminal loses focus or a key is pressed. The live region is a 1px-wide element, so each append re-lays-out text that keeps growing. Full-screen TUIs hit this constantly. With Claude Code's fullscreen mode in VS Code, the whole window freezes within seconds of scrolling and only recovers when the terminal is blurred (e.g. by switching terminal tabs).
This also counts a row's worth of characters as a line, so the existing limit applies.
Replaying a recording of Claude Code's fullscreen mode scrolling (200x50, WebGL, headless Chromium) three times, 9 s each:
Related: anthropics/claude-code#84712
🤖 Generated with Claude Code