<p>In <a href="https://github.com/geany/geany/pull/1228#discussion_r78348103">doc/geany.txt</a>:</p>
<pre style='color:#555'>> @@ -3357,6 +3357,10 @@ Delete to line start            Ctrl-Shift-BackSpace      Deletes from the begin
>                                                            current caret position.
>  
>  Duplicate line or selection     Ctrl-D                    Duplicates the current line or selection.
> +                                                    If the selection spans more than one line,
> +                                                    this duplicates the lines containing selections.
> +                                                    If the selection spans only a single line, then only
> +                                                    the selection is duplicated.
>  
</pre>
<p>Dunno, sounds more confusing than the "right thing", but anyway as you can tell I don't use it :)</p>

<p>Then a list just like your three dot points then, simple is better :)  The only thing would be that the middle point might say "if the selection is on one line only, only the selection is duplicated"</p>

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