Remove empty lines and tidy whitespace

Four separate options rather than one “tidy” button, because they are genuinely different jobs: drop blank lines, trim the spaces at each line's ends, collapse runs of blank lines into one, and collapse repeated spaces inside a line. Someone stripping trailing spaces usually wants their paragraph breaks kept, and a single control would quietly take those away.

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Settings

Remove empty linesTrim spaces at the start and end of each lineCollapse runs of blank lines into oneNot applicable while empty lines are being removed entirely.Collapse repeated spaces inside a line

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