MyBook/Library/PackageCache/com.unity.timeline@1.6.5/Editor/Manipulators/Utils/PlacementValidity.cs

namespace UnityEditor.Timeline
{
    enum PlacementValidity
    {
        Valid,
        InvalidContains,
        InvalidIsWithin,
        InvalidStartsInBlend,
        InvalidEndsInBlend,
        InvalidContainsBlend,
        InvalidOverlapWithNonBlendableClip
    }
}