Groups the containers into a single container by merging them.
The containers must all belong to the same timeline.
If the elements are all Clip-s then this method will attempt to combine them all into a single Clip. This should succeed if they: share the same start, duration and in_point; exist in the same layer; and all of the sources share the same Asset. If this fails, or one of the elements is not a Clip, this method will try to create a Group instead.
| containers |
The Container-s to group |
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The container created by merging |