Bugfix: Content Picker, gets dynamic root value from menu context (#2212)

Content Picker: refactors gathering dynamic root current and parent uniques

Uses `UmbMenuStructureWorkspaceContext.structure` to get the
top-most entity workspace's unique and parent unique values.

Author: leekelleher

src/packages/property-editors/content-picker/property-editor-ui-content-picker.element.ts

@@ -6,7 +6,6 @@ import { UmbLitElement } from '@umbraco-cms/backoffice/lit-element';
 import { UmbFormControlMixin } from '@umbraco-cms/backoffice/validation';
 import { UmbPropertyValueChangeEvent } from '@umbraco-cms/backoffice/property-editor';
 import { UMB_DOCUMENT_ENTITY_TYPE } from '@umbraco-cms/backoffice/document';
-import { UMB_ENTITY_WORKSPACE_CONTEXT } from '@umbraco-cms/backoffice/workspace';
 import { UMB_MEDIA_ENTITY_TYPE } from '@umbraco-cms/backoffice/media';
 import { UMB_MEMBER_ENTITY_TYPE } from '@umbraco-cms/backoffice/member';
 import type { UmbPropertyEditorConfigCollection } from '@umbraco-cms/backoffice/property-editor';
@@ -123,13 +122,11 @@ export class UmbPropertyEditorUIContentPickerElement
 		if (this._rootUnique) return;
 		if (!this.#dynamicRoot) return;
 
-		const workspaceContext = await this.getContext(UMB_ENTITY_WORKSPACE_CONTEXT);
-		const unique = workspaceContext.getUnique();
-		if (!unique) return;
-
 		const menuStructureWorkspaceContext = (await this.getContext('UmbMenuStructureWorkspaceContext')) as any;
-		const parent = (await this.observe(menuStructureWorkspaceContext.parent, () => {})?.asPromise()) as any;
-		const parentUnique = parent?.unique;
+		const structure = (await this.observe(menuStructureWorkspaceContext.structure, () => {})?.asPromise()) as any[];
+		const [parentUnique, unique] = structure?.slice(-2).map((x) => x.unique) ?? [];
+
+		if (!unique) return;
 
 		const result = await this.#dynamicRootRepository.requestRoot(this.#dynamicRoot, unique, parentUnique);
 		if (result && result.length > 0) {