Added a new optional callback when the panel has completed transitioning and is fully opened #1368
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Description
For the purpose of using HTML canvas drawing (notably for the GeoChart), I needed to know when the panel has completed expanding, to force a redraw of the canvas. Of course, this PR focuses on implementing the callback logic without knowledge of the specific reason for the callback. It can serve other purposes too.
Type of change
How Has This Been Tested?
Tested as part of the GeoChart plugin.
Checklist:
I have made corresponding changes to the documentationI have added tests that prove my fix is effective or that my feature worksNew and existing unit tests pass locally with my changesThis change is