The undo/redo doesn't always work

Got a fix up for this

I've manually tested this and I'm still seeing an issue with the following steps

1. Update a field on a component - add ' one'
2. observe the preview updates to show 'my heading one'
3. Update the field again - append ' two
4. observe the preview updates to 'my heading one two'
5. Click Undo
6. observe the preview reverts back to 'my heading one' and so does the field.
7. Click Redo
8. observe the preview DOES NOT update back to 'my heading one two' but the field in the sidebar does.

I have updated the undo-redo.cy.js test to check these steps (the test only checked the field values, not the markup in the preview which I assume is how this regression got through in the first place)

Yay, this is feeling much more robust now. Thanks

Automatically closed - issue fixed for 2 weeks with no activity.