Robin Gareus b51621a1ae Fix assert() when using DnD to import MIDI files
When importing a multi-track MIDI files with identical track-names,
Ardour would create the same file for each track. Effectively
overwriting an existing file.

The following MIDI file would create the same file twice
in `interchange/`, once for each MTrk.

```
MFile 1 2 240
MTrk
0 Meta SeqName "Foo Bar"
0 TimeSig 4/4 24 8
0 Tempo 666667
0 Meta TrkEnd
TrkEnd
MTrk
0 Meta TrkName "Foo Bar"
0 On ch=10 n=36 v=95
...
```
2022-01-19 19:22:51 +01:00
2022-01-13 00:10:54 +01:00
2022-01-17 20:38:40 +01:00
2020-10-18 17:45:32 +02:00
2020-07-06 21:36:12 +02:00
2021-03-23 23:27:45 +01:00

Please see the Ardour web site at https://ardour.org/ for all documentation..

For information on building ardour: 
      
     https://ardour.org/development.html
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