Revert over-eager bailout when trimming trailing whitespace #28848
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Broken by #27978, which removed the fallback. Before that change, if formatting processed no ranges, then trimTrailingWhitespacesForRemainingRange would instead use the original range. During the development of #27978, I thought it was necessary to instead skip trimming when no ranges were processed. This turns out to be wrong, so this PR reinstates the original behaviour.
Fixes #28781