TimelineEditor.Refresh uses these flags to determine what needs to be refreshed or updated.
Note: Use the | operator to combine flags.
| WindowNeedsRedraw | Use this flag when a change to the Timeline requires that the Timeline window be redrawn. |
| SceneNeedsUpdate | Use this flag when a change to the Timeline requires that the Scene be updated. |
| ContentsModified | Use this flag when a Timeline element was modified. |
| ContentsAddedOrRemoved | Use this flag when an element was added to or removed from the Timeline. |