src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/_didDropMarkupCell
class NotebookEditorWidget:	private _didDropMarkupCell(cellId: string, event: { dragOffsetY: number; ctrlKey: boolean; altKey: boolean }): void {
		const cell = this._getCellById(cellId);
		if (cell instanceof MarkupCellViewModel) {
			const webviewOffset = this._list.webviewElement ? -parseInt(this._list.webviewElement.domNode.style.top, 10) : 0;
			event.dragOffsetY -= webviewOffset;
			this._dndController?.explicitDrop(cell, event);
		}
	}