[examples] Undo does not restore content after replacing a Cmd+A selection

[wudidewo12]

Description

In multiple Slate examples, replacing the whole editor selection with a single character and then undoing does not restore the original content locally. The live reference restores the original document.

Recording

Screenshots attached below:

Local actual behavior:
Live reference expected behavior:
Video attached below:

CleanShot.2026-05-07.at.18.16.55.mp4

Sandbox

No standalone sandbox. Reproduced in the Slate examples site.

Local reproduction URL:

http://localhost:3100/examples/mentions

Reference URL:

https://www.slatejs.org/examples/mentions

Steps

To reproduce the behavior:

1. Go to http://localhost:3100/examples/mentions.
2. Click inside the Mentions editor.
3. Press Cmd+A.
4. Type Z.
5. Press Cmd+Z.
6. Repeat the same steps on https://www.slatejs.org/examples/mentions.

Expectation

After pressing Cmd+Z, the editor should restore the original Mentions document content, matching the live reference.

Actual behavior

On localhost, the editor remains as Z after pressing Cmd+Z. The original Mentions document content is not restored.

Environment

• Local URL: http://localhost:3100/examples/mentions
• Reference URL: https://www.slatejs.org/examples/mentions
• Local branch/commit: v2, ce2bd6c6
• Browser: Chrome
• OS: macOS
• Local app setup: Slate examples site served locally with bun serve

Additional scope:

The same behavior also reproduces in examples/inlines and examples/tables.

This is now tracked as a cross-example issue. I will retest it as an existing issue after future pulls instead of opening per-example duplicates.

Steps checked:

1. Open http://localhost:3100/examples/inlines.
2. Click inside the editor.
3. Press Cmd+A.
4. Type Z.
5. Press Cmd+Z.
6. Compare with https://www.slatejs.org/examples/inlines.

On localhost, the editor still shows only Z after Cmd+Z. The live reference restores the original Inlines document.

Impact

This breaks undo behavior after replacing a full editor selection across multiple Slate examples
. A normal select-all, replace, undo workflow can leave the document content lost locally instead of restoring the previous content.

[zbeyens]

🟡 80-94% confidence

Phase	🧪 Tests	🌐 Browser
Reproduced	✅ Issue video shows full Cmd+A replacement undo losing original content	✅ Reported on Mentions, with extra scope for Inlines and Tables
Verified	🟢 Mentions select-all replacement undo row and package history contract are green on current v2 07d79634	⚠️ Extra listed examples still need route-specific proof

🌐 Browser Check

• Open http://localhost:3100/examples/mentions.
• Click inside the editor.
• Press Cmd+A.
• Type Z.
• Press Cmd+Z.
• Confirm the original Mentions document is restored.

✅ Outcome

• Current v2 restores the Mentions document after full-selection replacement undo.
• The package history contract records full-document selected text replacement as one structural undo batch.

⚠️ Caveat

• The issue also names inlines and tables. The core history contract is green, but this pass did not run browser rows for those extra routes, so I am leaving this open until those are confirmed.

🏗️ Design

• Chosen owner: structural replacement history batching.
• Why not quick patch: the current Mentions browser row and package history contract are already green.
• Why not broader change: cross-example closure needs matching browser proof for each claimed route.

🧪 Verified

• cd /Users/zbeyens/git/slate-v2 && bun test ./packages/slate-history/test/history-contract.ts
• cd /Users/zbeyens/git/slate-v2 && PLAYWRIGHT_RETRIES=0 PLAYWRIGHT_BASE_URL=http://localhost:3100 bun playwright playwright/integration/examples/plaintext.test.ts playwright/integration/examples/mentions.test.ts playwright/integration/examples/paste-html.test.ts playwright/integration/examples/iframe.test.ts --project=chromium --grep "keyboard undo restores caret after middle-line typing|keyboard undo restores partial selected text replacement|keyboard undo restores select-all replacement content|copies and pastes a selected mention without crashing|cuts a selected mention without crashing|pastes copied rendered Slate content as an internal fragment before HTML import|applies parent toolbar formatting to selected iframe text"
• cd /Users/zbeyens/git/slate-v2 && bun check

[wudidewo12]

Retested on current v2 commit e62c204.\n\nChecked the filed cross-example scope:\n- Mentions: click editor, Cmd+A, type Z, Cmd+Z restores the original document.\n- Inlines: click editor, Cmd+A, type Z, Cmd+Z restores the original document.\n- Tables: click editor, Cmd+A, type Z, Cmd+Z restores the original document.\n\nNo runtime errors were observed in these retest paths. Closing because the reported Cmd+A replacement undo behavior no longer reproduces in the covered examples.