\retrograde fails on slurs

\retrograde fails on slurs

The section "Retrograde" in the Notation Reference is affected.
This became likely exposed with issue 2240; the corresponding
regtest does not cover it.  The problem was existent previously
for slurs and other spans inside of chords.


Also contains commit:

Add slur to modal-transform regtest motif

[lemzwerg, 2014-07-13 15:27:37]

LGTM.

https://codereview.appspot.com/110540043/diff/1/scm/modal-transforms.scm
File scm/modal-transforms.scm (right):

https://codereview.appspot.com/110540043/diff/1/scm/modal-transforms.scm#newc...
scm/modal-transforms.scm:134: \n(see).
@code{transposer-factory}

[dak, 2014-07-13 16:56:31]

On 2014/07/13 15:27:37, lemzwerg wrote:
> LGTM.
> 
> https://codereview.appspot.com/110540043/diff/1/scm/modal-transforms.scm
> File scm/modal-transforms.scm (right):
> 
>
https://codereview.appspot.com/110540043/diff/1/scm/modal-transforms.scm#newc...
> scm/modal-transforms.scm:134: \n(see).
> @code{transposer-factory}

Instead of the (see)?  Yeah, looks pretty nonsensical on second thought.  I just
wanted a different line wrap in order to keep Emacs from considering everything
after (see ... as a function, but it seems uncalled for anyway.

[lemzwerg, 2014-07-13 20:53:13]

Thanks.  LGTM.