Allow subtypes to specify "mutations", to control the behavior of the "Change…
41f0b8b0a3a1
Actions

Description

Allow subtypes to specify "mutations", to control the behavior of the "Change Subtype" action

Summary:
Fixes T13415. Provide a way for subtypes to customize the behavior of "Change Subtype" actions that appear above comment areas.

Subtypes may disable this action by specifying "mutations": [], or provide a list of subtypes.

The bulk editor and API can still perform any change.

Test Plan:

Tried to define an invalid "mutations" list with a bad subtype, got a sensible error.
Specified a limited mutations list and an empty mutations list, verified that corresponding tasks got corresponding actions.
Used the bulk editor to perform a freeform mutation.
Verified that tasks of a subtype with no "mutations" still work the same way they used to (allow mutation into any subtype).

Maniphest Tasks: T13415