When a newly selected diff loads while using the slider, the arrows should be temporarily disabled during loading.
This is a feature request from feedback on the RevisionSlider talk page[1][2].
[1] https://www.mediawiki.org/wiki/Topic:Tp06zmnxow0v1ar5
[2] https://www.mediawiki.org/w/index.php?title=Topic:Tp06zmnxow0v1ar5&topic_showPostId=tpcitb03z0d80in1#flow-post-tpcitb03z0d80in1 ( and the answer below )