An interface that allows value fields to visually represent a mixed value.
A mixed value refers to a situation where a value field is editing more than one value at a time. For example, when selecting multiple objects and editing the selection in the Inspector window, selected objects may have different values for the same property. This situation requires value fields to implement their own logic for supporting this situation.
| showMixedValue | Indicates whether to enable the mixed value state on the value field. |