The article discusses the challenges of integrating undo and redo functionality in collaborative editing scenarios using Conflict-Free Replicated Data Types (CRDTs). It first surveys the undo and redo semantics of current mainstream collaboration software and derives principles for undo and redo behavior in a collaborative setting.
The authors then apply these principles to a simple CRDT, the Multi-Valued Replicated Register, and present a novel undo and redo algorithm that implements the undo and redo semantics that they believe are most consistent with users' expectations. The key aspects of the algorithm are:
The authors also discuss the correctness, performance, and integration of their algorithm with the Automerge CRDT library. They demonstrate that their approach can provide the expected undo and redo semantics while maintaining strong eventual consistency in a collaborative editing scenario.
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by Leo Stewen,M... at arxiv.org 04-18-2024
https://arxiv.org/pdf/2404.11308.pdfDeeper Inquiries