62dcf39ef0
Added remove unused imports assist This resolves the most important part of #5131. I needed to make a couple of cosmetic changes to the search infrastructure to do this. A few open questions: * Should imports that don't resolve to anything be considered unused? I figured probably not, but it would be a trivial change to make if we want it. * Is there a cleaner way to make the edits to the use list? * Is there a cleaner way to get the list of uses that intersect the current selection? * Is the performance acceptable? When testing this on itself, it takes a good couple seconds to perform the assist. * Is there a way to hide the rustc diagnostics that overlap with this functionality?
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