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Hmm, I had only considered using a continuation of "...". 
Using spaces would make things look mostly right, and will
have odd behaviour only when you cut-and-paste into an
editor, since you will get an extra indentation level, but
that won't cause errors and is easily fixed.

Here is a new patch that implements it this way.  I think
doing it this way solves the problem well enough that the
preference is not necessary.  (Or both patches can be
applied to get this behaviour and the preference.)