relate topic associated lesson dropdown to only show lessons based on associated course selected
This should be an easy fix: If you have many courses with many lessons, the topic associated lesson dropdown becomes prohibitively long. If an associated course has been selected, then the associated lesson dropdown menu should only contain lessons associated with that course - not all lessons in the system. This becomes particularly problematic if you have lessons with the same name as lessons in another course (e.g. "Video" or "Chapter 1"). Duplicate names are not otherwise an issue as the list can be filtered and different permalink assigned.
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Jonathan commented
Further information: It seems as if this issue only occurs when editing an existing topic. It behaves as I suggest when adding a new topic. So, to refine my suggestion, I suggest applying this logic to editing the associated lesson for existing topics.