Selective Merged Undo for Real-Time Collaborative Editing

In this paper, we will describe our methods and implementation the use of selective merge undo on collaborative editing system. Our approach will satisfy both convergence and inverse properties and overcome the challenges associated with collaborative editing systems using operation transformation. Our proposed undo approach uses selective merged to undo characters edits on documents in collaborative editing systems with operation transformation base in a group format rather than to undo them one by one. Our implementations and test results will show the efficiency and effectiveness of our approach.