Undo/redo functionality in pedigree editor may misbehave when un-linked patients are involved

Description

See steps to reproduce in a post by in https://github.com/phenotips/phenotips/pull/2658

Environment

None

Assignee

Andrew Misyura

Reporter

Andrew Misyura

Labels

None

External issue ID

None

Components

Fix versions

Affects versions

Priority

Medium
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