I know we have already asked about this problem twice, but English.SE has now had its third question about the difference between that and which (first, second). The “Ask Question” page is supposed to pop up a list of related questions, but because that and which are both “stop words”, When you start a question on this topic using any of the most obvious obvious ways to phrase the question—for example, “When to use ‘that’ and when to use ‘which’”, “How do I know when I should write ‘that’ or ‘which’”, “‘That’ or ‘Which’: that is the question”—nothing pops up in the Related Questions box.
Are we doomed to forever being unable to warn users that their question has already been asked if it happens to be a question about stop words, which are asked about all the time on English.SE?
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operator.