Robin Gareus c8585fce90 Cont'd work to prevent region creation signal-emission
This fixes another deadlock calling send_change with the
Playlist's RegionWriteLock held.

In this case due to "MIDI region copies are independent"
when duplicating MIDI regions.

```
ARDOUR::Region::send_change ()
PBD::Stateful::apply_changes ()
ARDOUR::RegionFactory::create ()
ARDOUR::RegionFactory::create ()
ARDOUR::MidiRegion::clone ()
ARDOUR::RegionFactory::create ()
ARDOUR::Playlist::duplicate ()
```
2021-05-01 16:21:17 +02:00
2016-06-25 00:44:04 +02:00
2020-10-18 17:45:32 +02:00
2020-07-06 21:36:12 +02:00
2021-03-23 23:27:45 +01:00
2020-01-25 04:07:41 +01:00
2021-03-30 15:29:53 +02:00

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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