src/vs/base/browser/ui/dropdown/dropdownActionViewItem.ts/DropdownMenuActionViewItem/getTooltip
class DropdownMenuActionViewItem:	protected override getTooltip(): string | undefined {
		let title: string | null = null;

		if (this.action.tooltip) {
			title = this.action.tooltip;
		} else if (this.action.label) {
			title = this.action.label;
		}

		return title ?? undefined;
	}