Type Alias: CollapseState
CollapseState =
"collapsed"|"expanded"|"leaf"
Defined in: view/collapse-state.ts:13
What gantt.collapseStateOf(id) answers for one row (#424): 'leaf' for a row that cannot
expand, 'collapsed'/'expanded' for one that can. Apart from undefined, which the method
answers instead for an id no current row holds — a removed row, or a stale id.