src/vs/editor/browser/controller/mouseHandler.ts/TopBottomDragScrolling/constructor
class TopBottomDragScrolling:	constructor(
		private readonly _context: ViewContext,
		private readonly _viewHelper: IPointerHandlerHelper,
		private readonly _mouseTargetFactory: MouseTargetFactory,
		private readonly _dispatchMouse: (position: IMouseTarget, inSelectionMode: boolean, revealType: NavigationCommandRevealType) => void,
	) {
		super();
		this._operation = null;
	}