If 2 or more people are editing a entry at the same time in Craft, the last person to save the entry overrides everyone else's work. It doesn't seem any diffing is involved to resolve this. I'm using matrix fields mostly.
WordPress handles it by locking a post while someone is editing. This is done by sending an AJAX request to the server when auto saving, updating the "last edited" date and which user is editing.
Does anyone know if a plugin exists already for Craft that implements this post locking feature? Or is there something already in Craft to avoid these conflicts?