[PATCH] musicxml2ly: Avoid duplicate "tr" if both <trill-mark> and, <wavy-line> are present

[Thomas Weber]

Another patch for musicxml2ly: In situations like this:

    <trill-mark default-y='20'/>
    <wavy-line type='start' number='1'/>

this will be created:

    \trill \startTrillSpan

It should only be \startTrillSpan.

(My changes can also be found on Github: https://github.com/th-we/lilypond.)

Greets,
Thomas Weber

0001-musicxml2ly-Avoid-duplicate-tr-if-both-trill-mark-an.patch
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trill-test.xml
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trill-test.ly
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