fix: use breakable instead of unbreakable whitespace when formatting tokens #5513
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…tokens The formatter was using `tk ++ " "` to separate tokens from tokens they would merge with, but `" "` is not whitespace that could merge. This affected large binder lists, which wouldn't pretty print with any line breaks. Now they can be flowed across multiple lines. Closes leanprover#5424
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The formatter was using
tk ++ " "to separate tokens from tokens they would merge with, but" "is not whitespace that can break. This affected large binder lists, which wouldn't pretty print with any line breaks. Now they can be flowed across multiple lines.Closes #5424