jaredandClaude Sonnet 5
3cca956ee7
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insertMarkdownFormat, insertMarkdownText, toolbarList, toolbarHeading,
and toolbarQuote all set textarea.value = ... directly. Assigning
.value programmatically discards the browser's entire native undo
stack (vs. document.execCommand('insertText', ...), which preserves
it) — e.g. type a paragraph, click Bold, then Ctrl+Z undid the whole
paragraph instead of just the bold markup.
Added insertTextPreservingUndo(), which selects the exact range being
replaced and routes through execCommand('insertText', ...) — the same
mechanism real typing uses — falling back to the old direct assignment
(losing undo, matching prior behavior) only if execCommand is
unavailable or unsuccessful.
Verified with a jsdom harness that the fallback path (jsdom doesn't
implement execCommand, since native undo is a real-browser-only
feature untestable via jsdom) produces byte-identical resulting text
and cursor positions to the original implementation across all 5
toolbar functions, for both selected and cursor-only cases.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MGDKHiU5RJdo3dqQUDow3X