YMultiDocUndoManager is not compatible with yjs version above 13.6.12

[furkan3ayraktar]

Describe the bug
YMultiDocUndoManager clears the entire undo stack instead of popping one when it's used together with yjs version 13.6.13 or any version above that.

To Reproduce
Steps to reproduce the behavior:

1. Install yjs version 13.6.13 or above
2. Install y-utility
3. Create a YDoc and instantiate a YMultiDocUndoManager
4. Do some operations on the doc and try undoing.
5. Observe that all operations are undoed instead of the last one

Expected behavior
Only last operation is undoed instead of all operations.

Environment Information

• Browser [e.g. Chrome]
• yjs v13.6.18
• y-utility v0.1.4

• This issue is a blocker for my project.

[furkan3ayraktar]

Related to yjs/yjs#645

[dmonad]

Thanks! This is now fixed in the latest Yjs release (Yjs@13.6.18)

[furkan3ayraktar]

Thank you 🙌