I was entering this question on Russian.SE and attempted to put two question marks in the title after the hyphen (I first tried to use title Смеяться - рассмешить, улыбаться - ??)
When I submitted the question, the title was changed to Смеяться - рассмешить, улыбаться -?
I can understand (although not necessarily agree with) replacing two consecutive question marks in the title with one, but I believe removing the space before the question mark is a bug. While in most cases it would be a valid scenario (i.e. question at the end of the sentence), if the question mark follows a space after another punctuation sign, then the space should not be removed.