Unlocking behind popup on returning visits #263

Subject of the issue/enhancement/features

On a returning visit, trickle reveals the next step while a popup (tutor/notify) is still open, instead of waiting for the popup to be closed. It only occurs on a returning visit (when a bookmarking resume prompt has been shown); a first visit behaves correctly.

This is more noticeable when "_autoScroll": true, as this will take place behind the popup.

Steps to reproduce

1. Author a page with trickle step-locking enabled on blocks containing questions that show feedback via a popup (tutor notify), with the trickle button disabled (_button._isEnabled: false).
2. Enable adapt-contrib-bookmarking so a resume prompt is shown on return.
3. Visit the course, progress partway so a bookmark is saved, then leave (close/exit) with at least one trickle step still incomplete.
4. Return to the course and accept the resume prompt to navigate back to the bookmarked page.
5. Resume at the first incomplete step and submit the question.