The case where User B navigates to cursor offset 0 as User A inserts at position 0 is actually easy because User B's cursor can just stay at 0. A harder case wo

The case where User B navigates to cursor offset 0 as User A inserts at position 0 is actually easy because User B's cursor can just stay at 0. A harder case would be where User B moves to cursor offset X while User A removes text between (Y, Z) where 0 < Y < Z < X. How that situation gets handled is up to the application developer. I'm not familiar with OT specifically, but the text editor I'm working on is just a proof-of-concept for the database. The database I'm building is designed to make it very easy to program very complicated multi-player scenarios, although it requires a little work to think of conflict resolution.