Robin Gareus ebf59d4426 Insert_or_assign properties, allow to override properties
This allows to copy a property list and then selectively
replace various properties. e.g.

```
PropertyList plist (region->properties ());
plist.add (Properties::length, len);
plist.remove (Properties::start);
```

See also 8b0ab38675
and 97f0fac7d5
This also fixes the issue referenced in
8c83149c4c
2022-10-07 00:32:14 +02:00
2022-04-08 19:51:02 +02:00
2022-04-08 19:51:02 +02:00
2022-10-05 05:23:30 +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
2022-10-07 00:31:48 +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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