Wikimedia Bugzilla is closed!

* Open a document in a language that is not your default language,
  for example:
  https://fr.wikipedia.org/wiki/Cumul_des_mandats_en_France?veaction=edit
  (if you're not French).
* Assuming your browser does have a French dictionary, the article should
  have few to 0 red-underlined words.
* Click on a [1] reference.
* Observe suddenly almost every word is spellcheck invalidated by red lines
* Moving the cursor by keyboard arrows still keeps them invalid.
* As soon as you actually use the mouse to click for a cursor move, that is
  when it switches back to the correct language (or perhaps it disables
  spellcheck)

Not sure, but I think this is a regression.