Conflict with Jupyter RTC

[lahwaacz]

This extension conflicts with the Jupyter Real-Time Collaboration extension. RTC has its own autosave mechanism based on a time delay (0.5s by default). When a notebook is saved by RTC, autosave-on-focus-change detects a conflict and displays a dialog to either revert or overwrite the file:

Note that when the RTC extension is active, files can be opened either in collaborative (default) or non-collaborative mode, so having both extensions at the same time would still make sense.

[s-weigand]

I can see how that is disturbing a user's workflow.
However, I currently don't have the time to dive into a 3rd party codebase and figure out how things work there to implement a cross-extension interoperability (especially since I nowadays use vscode for my notebook needs and thus neither use this extension nor RTC myself).
But PRs are welcome.

[lahwaacz]

Actually, fixing #51 already makes this much less of a problem (when the RTC autosave period is short enough)...