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Use RNA_api_sequences() for SequenceEditor and MetaSequence sequences member. Defines pair of dispatch functions rna_Sequences_editing_* and rna_Sequences_meta_* that pass pointer to seqbase to rna_Sequences_* function. Downside of this implementation is, that it defines 2 seemingly different RNA collections - SequencesMeta and SequencesTopLevel Reviewed By: mont29 Differential Revision: https://developer.blender.org/D9601