Function getHeadingInfo

getHeadingInfo(cell): {
    collapsed?: boolean;
    headingLevel: number;
    isHeading: boolean;
}
If given cell is a markdown heading, returns the heading level. If given cell is not markdown, returns 7 (there are only 6 levels of markdown headings)
Parameters
- cell: Cell<ICellModel>
  The target cell widget.
Returns {
    collapsed?: boolean;
    headingLevel: number;
    isHeading: boolean;
}
- Optional collapsed?: boolean
- headingLevel: number
- isHeading: boolean
- Defined in packages/notebook/src/actions.tsx:2067