<p>My comment seems to have been "misplaced", it said:</p>

<p>The keystroke is used to do two things, duplicate selection and duplicate lines, so it has to choose which one to do. </p>

<p>The choice is to duplicate lines anytime the selection includes a line end, or there is no selection, otherwise to duplicate the selection.</p>

<p>The documentation could be improved to spell this out.</p>

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