Manually aligning lines in TortoiseMerge

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From the mailing list 
(http://tortoisesvn.tigris.org/ds/viewMessage.do?dsForumId=4061&dsMessageId=2832
664)

There is a feature which I found in 'diffuse' (http://diffuse.sf.net) and
which would be a nice addition to TSVN. In diffuse, you can select a line in
the left and right file and tell diffuse to align them with each other. This
is useful when the build-in matching of old an new lines simply doesn't work
or doesn't work correctly.

An example where [T]SVN fails to match lines is a change like this:

A A
B D
     B1
C C

Line D was inserted and line B was changed to B1. However, even though B is
much more similar to B1, the change is displayed from B to D and B1 is
considered as newly inserted. Manually telling the diff viewer that B1 is the
equivalent to B would allow displaying a better diff.

Original issue reported on code.google.com by tortoisesvn on 30 Aug 2011 at 5:54