Elmoed (?) bug: Editors are created excessively, when swapping slides

- Elmoed (?) bug: Editors are getting created EVERY TIME we swap slides (at least for browser)

- This is probably memory leakage, and possibly some sort DOM leakage where slides aren't getting properly destroyed :(

Start by reproducing the issue in a browser while swapping slides, then trace where editors are created and where slides are destroyed. Done means swapping slides no longer creates editors every time and the suspected memory or DOM leakage is resolved.

Written by the indexing model from the issue text.