* Hide toolbar when selection is out of view
* properly dispose of toolbar visibility listener
* Add test
* rename toolbarvisibility
* Make visibility for toolbar nullable
* Properly dispose of toolbar visibility listener
* Merge visibility methods into one
* properly dispose of start selection view listener
* Add some docs
* remove unnecessary null check
* more docs
* Update dispose order
Co-authored-by: Renzo Olivares <roliv@google.com>
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