OT: Where from come this seemingly odd and new habit of spacing inside parentheses? I always write "(a, b)", mostly because it is closer to English (or other languages) typography, and it seem to have good readability, plus it is, I believe, the standard in most languages. So why write "( a, b )"?

By the way, if some like spacing that much, and if the reason is to have a better mouse-selectability, then I humbly propose "( a , b )".