Hi! My teachers often get in the titles of the question – https://www.evernote.com/shard/s2/sh/d6de6453-fe39-4b9a-b701-cbb82e8a5b… Of course, it is possible to edit the title later, but annoys too much :) Content of the questions frequently forms with copy/pasting from MS Word, so there are a lot of non breaking spaces.
This is because they forget to fill in the title of the question.
Anyway, i will add this to our queue list, a check_plain() is probably missing.
Thank you for the feedback,