T141871 adds a bar to show and hide the revisionSlider.
Task: Add a possibility to "pin" the revisionSlider, leaving it open for every time you visit this page - unless you unpin it again. The pin should be part of the revisionSlider bar.
This is part of adding the revision slider to the revision diff page. The revision slider is a feature that adds a visualization of all revisions to the compare screen.
The revision slider was originally prototyped by the WMF Community Tech team and then handed over to the WMDE TCB team, as it is also a solution to fulfill a wish of the German Community Wishlist: https://de.wikipedia.org/wiki/Wikipedia:Umfragen/Technische_W%C3%BCnsche_2015/Artikel#Anzeige_aller_Bearbeitungskommentare_im_Diff