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When adding a dependent or parent ticket, the choice field in the ticket selection form excludes: - All existing dependencies of the current ticket. - All existing parent tickets of the current ticket. - The current ticket itself. The first two prevent immediate circular references: A dependency cannot be a parent and vice versa. Deeper circular references are not covered by this: a ticket can still be its own grandchild. They also prevent current behavior of throwing an `IntegrityException` when selecting a dependency or parent. The third one prevents also a quirky behavior: until now, specifying the ticket itself as parent or dependency just does not save the dependency and does not issue a warning either.