This anomaly is present in master as of July 4,2018.
create new patient
open pedigree editor and chose an existing family
nothing happens; the patient isn't added to the family (expected behaviour is to prompt the user to save/cancel their changes)
: NOTE for release notes: this behaviour is caused by a combination of other changes done for 1.4RC1, a similar problem may exists in 1.4m4 but in a different form, namely something covered by PT-3718. So release notes should only explicitly mention in pedigree section