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Here’s a major problem you have. First, understand Nielson’s 10 heuristics. If you have any sort of recognizable CS degree, just ignore that, as you probably already covered them.
The problem with your plugin lies in error messages. If a user attempts an edit on a file, saves the edit and no edit is actually made to the file, an error message should show to explain what happened and what the next steps are. This is Nielson’s 9th heuristic, “help users recognize, diagnose, and recover from errors”.
Neat plugin idea otherwise, nice work. Just nail your UX.