Problem
Currently, the editor column is automatically scrolled to the first own changed line. The changes column is also scrolled to the first change. However, since the changes column places a title above ( "In your version" ), the texts end up to be misaligned

Task
Let the editor scoll one line further down, so that the text shows up right next to the text in the changes column.

Background:
This is part of fulfilling wish #1 of the German-speaking community wishlist 2015 (T143823).
The solution is a result of on-wiki discussion and Wikimania 2016 sessions and testings, as well as feedback we received to the prototype.