bug#56418: Add duplicate-dwim [PATCH]

[Mattias Engdegård]

This patch adds duplicate-swim, a command that works like duplicate-line but 
works on the region if active. It corresponds exactly to upcase-dwim, 
downcase-dwim and capitalize-dwim which have become quite popular.

Rectangular regions are treated specially by duplicating on the right-hand 
side. This behaviour turns out to be the most convenient one, and is also 
confluent with that of ordinary regions when the rectangle is only one line 
tall.

0001-Add-duplicate-dwim.patch
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