src/vs/workbench/contrib/notebook/common/notebookOptions.ts/NotebookOptions/computeTopInsertToolbarHeight
class NotebookOptions:	computeTopInsertToolbarHeight(viewType?: string): number {
		if (this._layoutConfiguration.insertToolbarPosition === 'betweenCells' || this._layoutConfiguration.insertToolbarPosition === 'both') {
			return SCROLLABLE_ELEMENT_PADDING_TOP;
		}

		const cellToolbarLocation = this.computeCellToolbarLocation(viewType);

		if (cellToolbarLocation === 'left' || cellToolbarLocation === 'right') {
			return SCROLLABLE_ELEMENT_PADDING_TOP;
		}

		return 0;
	}