In QUIZ: trimming students's short answers of all extra spaces within the answer (even between words)

Hello,
In Quiz, with short answers,
at the moment, when the expected answer is "the cat" and the received answer is " the cat" the answer is considered as wrong. Joseph Réseau has created a parch that works for M1.9 and Tim Hunt sees no reason why it should not be made standard in M2. (see here :https://moodle.org/mod/forum/discuss.php?d=272781#p1174176).

Besides, another trimming should be: removing extra spaces before punctuation; so that when the expected answer is "The sun is shining." an answer such as "The sun is shining ." would be accepted.

Many thanks for looking into this.
Philippe