Using this persistent field in `select_more_less_seq__internal` was inapropriate in this case. Split select more/less and linked code, because it was mixed in `select_more_less_seq__internal()` These operators work in completely different way. `select_linked_internal()` doesn't use seq->tmp at all. `seq->tmp` was used to mask strips selected by operator while iterating. Use GSet to store temporary data instead of `seq->tmp`. Reviewed By: sergey Differential Revision: https://developer.blender.org/D10326