Created attachment 146796 [details] [review]
Correctly generates <audio> tags for brasero project

To reproduce:
1. Open Rhythmbox
2. Make a new playlist
3. Copy some tracks to new playlist
4. Select Burn

Result:
Brasero opened with only one track

Expected:
Brasero shows all tracks in playlist

Cause:
The brasero project in /tmp has invalid <audio> tags, i.e.:

<?xml version="1.0" encoding="UTF8"?>
<braseroproject>
        <version>0.2</version>
        <label>burn test</label>
        <track>
                <audio>
                       
<uri>file%3A%2F%2F%2Fhome%2Fbob%2FMusic%2FPink%2520Floyd%2FThe%2520Wall%2520%28disc%25202%29%2F11%2520-%2520Stop.mp3</uri>
                        <start>0</start>
                        <title>Stop</title>
                        <artist>Pink%20Floyd</artist>
                       
<uri>file%3A%2F%2F%2Fhome%2Fbob%2FMusic%2FHarvey%2520Danger%2FLittle%2520by%2520Little%2520%28bonus%2520disc%29%2F09%2520-%2520hidden%2520track%3A%2520The%2520Piano%2520Lesson.m4a</uri>
                        <start>0</start>
                        <title>hidden%20track%3A%20The%20Piano%20Lesson</title>
                        <artist>Harvey%20Danger</artist>
                </audio>
        </track>
</braseroproject>

instead of:

<?xml version="1.0" encoding="UTF8"?>
<braseroproject>
        <version>0.2</version>
        <label>burn test</label>
        <track>
                <audio>
                       
<uri>file%3A%2F%2F%2Fhome%2Fbob%2FMusic%2FPink%2520Floyd%2FThe%2520Wall%2520%28disc%25202%29%2F11%2520-%2520Stop.mp3</uri>
                        <start>0</start>
                        <title>Stop</title>
                        <artist>Pink%20Floyd</artist>
                </audio>
                <audio>
                       
<uri>file%3A%2F%2F%2Fhome%2Fbob%2FMusic%2FHarvey%2520Danger%2FLittle%2520by%2520Little%2520%28bonus%2520disc%29%2F09%2520-%2520hidden%2520track%3A%2520The%2520Piano%2520Lesson.m4a</uri>
                        <start>0</start>
                        <title>hidden%20track%3A%20The%20Piano%20Lesson</title>
                        <artist>Harvey%20Danger</artist>
                </audio>
        </track>
</braseroproject>