src/vs/workbench/browser/parts/editor/editorDropTarget.ts/EditorDropTarget/findTargetGroupView
class EditorDropTarget:	private findTargetGroupView(child: HTMLElement): IEditorGroupView | undefined {
		const groups = this.accessor.groups;

		return groups.find(groupView => isAncestor(child, groupView.element) || this.delegate.containsGroup?.(groupView));
	}