feat: multi-cursor editing#14
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Add full multi-cursor support: select next/all occurrences, add cursors via Alt+Click, type/delete/enter at all cursors simultaneously with single-step undo via BatchCommand grouping. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Two bugs prevented multi-cursor edits from working: 1. syncTabs() in Render() overwrote Editor.Multi on every redraw, losing cursor state set by SelectNextOccurrence(). Fixed by saving Multi back to the tab after mutations and after HandleEvent. 2. Cursor position adjustments went the wrong direction — adjusting unprocessed cursors (earlier positions) instead of already-processed ones (later positions). Rewrote adjust helpers to fix later-index cursors after each edit in the right-to-left loop. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Use reverse style for all cursor positions so they appear as solid blocks of the editor foreground color. Hide the hardware cursor when multi-cursor is active so all cursors render uniformly. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Update README and docs-web with multi-cursor keybindings and behavior: Ctrl+D, Ctrl+K L, Alt+Click, Ctrl+K U, Escape. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
New files
internal/core/multicursor/multicursor.go— MultiCursor data structureinternal/core/multicursor/multicursor_test.go— unit testsinternal/core/undo/undo_test.go— BatchCommand testsTest plan
go test ./...— all 22 packages passmake build— clean build🤖 Generated with Claude Code