Bug Report: Undo (Cmd+Z) doesn't work with bold formatting

[cstack]

Problem:
When I bold text in a card and then press Cmd+Z to undo, it keeps the bolding and undoes the previous edit instead.

Steps to reproduce:

1. Open card editor
2. Type some text
3. Select text and press Cmd+B (or click bold button)
4. Press Cmd+Z
5. Expected: Bold formatting is removed
6. Actual: Previous text edit is undone, bold remains

Technical Analysis:
This happens because Anki prevents the browser’s native Cmd+B and uses custom DOM manipulation instead. The browser’s undo system only tracks native
execCommand operations, not manual DOM changes.

Environment:

• Platform: MacOS 15.5 (24F74)
• Anki version: ⁨25.02.5 (29192d15)⁩
  Python 3.9.18 Qt 6.6.2 PyQt 6.6.1

This seems like a development issue where the custom formatting system needs to integrate with browser undo.

GitHub Issue Draft (If developers triage from forum)

Bug: Bold formatting bypasses browser undo system

Description
Bold formatting (Cmd+B/Ctrl+B) creates <b> tags but doesn’t integrate with browser undo, causing Cmd+Z to skip formatting changes.

Root Cause

1. content-editable.ts:137-141 prevents native Ctrl+B via preventDefault()
2. Custom DOM manipulation in surround/apply/format.ts wraps text in <b> tags
3. Browser undo only tracks native execCommand operations, not manual DOM changes
4. Result: formatting operations are invisible to undo system

Expected Behavior
Cmd+Z should undo bold formatting applied via Cmd+B or bold button.

Current Behavior
Cmd+Z skips formatting and undoes previous text edits.

Affected Files

• ts/editable/content-editable.ts - Prevents native shortcuts
• ts/lib/domlib/surround/apply/format.ts - DOM manipulation
• ts/editor/editor-toolbar/BoldButton.svelte - Bold implementation
• ts/editor/surround.ts - Surrounder class

Solution Options
Preserve <b> tag behavior while adding undo integration via manual undo management or input event simulation.