Function getExpandIndicator

getExpandIndicator(
    hasChildren: boolean,
    isExpanded: boolean,
    isLoading: boolean,
): string
Get expand/collapse indicator for a node.
Parameters
- hasChildren: boolean
  Whether node has children
- isExpanded: boolean
  Whether node is expanded
- isLoading: boolean
  Whether node is loading
Returns string
Indicator character
- Defined in core/src/widgets/tree.ts:441