Currently, the changes do not break the text. This leads to very different lines than in the editor winodw, which makes it harder in finding the same text there.
Task: Disallow horizontal scrolling for all parts in the UI.
This is part of fulfilling wish #1 of the German-speaking community wishlist 2015 (T139601).
The solution is a result of on-wiki discussion and Wikimania 2016 sessions and testings, as well as feedback we received to the prototype.