This is a proof-of-concept plugin for IntelliJ.
It used to show diff between two VCS revisions using sliders to choose revision.
The idea was to make diffing files a bit easier than in "Show History" panel.
The problem is that it's important to keep diff scrollers at the same vertical position while changing file revisions.
I didn't find how to implement this.
(At the moment this plugin shows history for a method. Note that there is already "Method History" action in IntelliJ.)
History with sliders used to look like this (see two sliders at the bottom):
(Note that this plugin will only work within live-plugin.)