0e8c7272eb
Previously, when running timefx on multiple regions on
the same track, undo commands accumulated for each region
in the playlist. Resulting in duplicate actions on undo/redo.
```
<UndoTransaction tv-sec="1649607270" tv-usec="646684" name="pitch shift">
<StatefulDiffCommand obj-id="1690" type-name="ARDOUR::AudioPlaylist">
<Changes>
<Regions>
<Add id="4046"/>
<Remove id="2284"/>
</Regions>
</Changes>
</StatefulDiffCommand>
<StatefulDiffCommand obj-id="1690" type-name="ARDOUR::AudioPlaylist">
<Changes>
<Regions>
<Add id="4046"/>
<Add id="4057"/>
<Remove id="2284"/>
<Remove id="2388"/>
</Regions>
</Changes>
</StatefulDiffCommand>
...
```
Please see the Ardour web site at https://ardour.org/ for all documentation..
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https://ardour.org/development.html