[ENSCORESW-840]. seq region boundaries are fetched from the db (for slices stored in the db) in case of circular chromosomes. This is because it is impossible to recompute the seq_region_start|end for a feature in a circular slice since the transformation operated in method _objs_from_sth in the corresponding adaptor is not invertible. For some of the features (e.g. those in the Bio::EnsEMBL::FeaturePair hierarchy), we can't query the db and the methods seq_region_start|end return undef even if the feature is on a slice.
[ENSCORESW-840]. seq region boundaries are fetched from the db (for slices stored in the db) in case
of circular chromosomes. This is because it is impossible to recompute the seq_region_start|end for
a feature in a circular slice since the transformation operated in method _objs_from_sth in the
corresponding adaptor is not invertible.
For some of the features (e.g. those in the Bio::EnsEMBL::FeaturePair hierarchy), we can't query
the db and the methods seq_region_start|end return undef even if the feature is on a slice.

muffato/ensembl,danstaines/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,at7/ensembl,muffato/ensembl,muffato/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,muffato/ensembl,danstaines/ensembl,mjg17/ensembl,mjg17/ensembl,at7/ensembl,james-monkeyshines/ensembl,danstaines/ensembl,at7/ensembl,mjg17/ensembl,mjg17/ensembl,Ensembl/ensembl,at7/ensembl,Ensembl/ensembl