It seems that the interface getPlaybackRegionHeadAndTailTime()
for the ARA extension is not accessible via the JUCE interface. So it doesn’t seem possible to change the head time and tail time of the playback regions which are always null (nor to notify the host of this change).
The ARADocumentControllerSpecialisation::ARADocumentControllerImpl
class should implement the doGetPlaybackRegionHeadAndTailTime()
method inherited from DocumentControllerDelegate
(and we should be able to modify these values via the ARAPlaybackRegion
class I guess).