As a translator, I would like to type the translated content without having to scroll the page to see where is the cursor. However, during the translation of the article Web of trust from English to Portuguese, this scrolling happend a lot (say, after any key press which added or removed content). This was annoying and counterproductive.
See the attached screencast:
The behavior is also present when translating other articles (e.g. Riemann hypothesis, Universal algebra).
It is seen commonly with article that has Infobox template at the start of the article.
Another example for testing: https://es.wikipedia.org/w/index.php?title=Especial:Traducci%C3%B3n_de_contenidos&page=%E0%AA%A7%E0%AB%8B%E0%AA%B3%E0%AB%80%E0%AA%A7%E0%AA%9C%E0%AA%BE+%E0%AA%A1%E0%AB%87%E0%AA%AE&from=gu&to=es&targettitle=&campaign=interlanguagelink
This seems to be experienced by many users, see the report at https://www.mediawiki.org/wiki/Topic:Vsc0kdj189lrmhzj.
I got the same problem when translating Pratt & Whitney R-1340 Wasp. I got several console logs error (which attached to this comment as .png file); it looks like a issue about code error rather than a problem about browser.
Note: And also, when trying to save, I additionally got this console error:
