Daneel 31ad038360 patches: fix O(position) lag — use lineForAXIndex: instead of lineRangeForRange: ...

postAccessibilityNotificationsForFrame: was calling NSString
lineRangeForRange: to detect line-crossing cursor moves.  That
method scans from the start of the string, making it O(cursor_offset).
In large buffers with the cursor near the end, this executes on every
redisplay cycle — causing progressive slowdown proportional to cursor
position.

patch 0002 already builds lineStartOffsets in ensureTextCache (O(N)
once per text change) and exposes lineForAXIndex: (O(log L) binary
search).  Use it instead.

Also remove the now-redundant tlen clamping that existed solely
to prevent lineRangeForRange: from receiving an out-of-range index.
lineForAXIndex: handles out-of-range inputs safely.

2026-03-01 08:29:58 +01:00

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