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perf: skip full-buffer joins on cursor motion - #14
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Paren-match used to string/join and count every line on every key; cache a char vector against :lines identity, and only expand the visible slice of long lines for display. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
:linesidentity so paren-match / electric-pair / indentnthinstead ofstring/join+count/subson every keystroke (cursor motion does not rebuild).char-atisnth, notsubs.display-colwalks only up to point;line-display-windowstill maps the whole line for spans but only builds the visible slice of expanded text.Test plan
lg test/run.lgC-n/C-pC-e/C-a) still paints tabs/caret notation correctly and the cursor lands on the right column)still highlights the matching opener;(still looks forwardMade with Cursor