srothgan 9c4db800ef feat(textarea): add atomic range editing support (#19) ...

- add public AtomicRange API with validation and diagnostic errors
- make cursor movement, deletion, insertion, selection, undo/redo, and set_lines atom-aware
- clear caller-derived atomic ranges after successful content mutations
- add focused atomic range tests plus serde coverage
- document atomic ranges and add a caller-owned parsing example

2026-07-01 04:17:20 +10:00

2.2 KiB

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