Tiptap: Validates toolbar configuration value (#2393)

Adds `isValidTiptapToolbarValue()` method

to ensure that the Tiptap toolbar value is in the correct structure.

src/Umbraco.Web.UI.Client/src/packages/tiptap/property-editors/tiptap/components/property-editor-ui-tiptap-toolbar-configuration.element.ts

@@ -32,17 +32,18 @@ export class UmbPropertyEditorUiTiptapToolbarConfigurationElement
 
 	@property({ attribute: false })
 	set value(value: UmbTiptapToolbarValue | undefined) {
-		if (!value) {
+		if (!this.#isValidTiptapToolbarValue(value)) {
 			this.#value = [[[]]];
-		} else {
-			// TODO: This can be optimized with cashing;
-			this.#value = value ? value.map((rows) => rows.map((groups) => [...groups])) : [[[]]];
+			return;
+		}
+
+		if (value.length > 0) {
+			this.#value = value.map((rows) => rows.map((groups) => [...groups]));
 			value.forEach((row) => row.forEach((group) => group.forEach((alias) => this.#inUse.add(alias))));
 		}
 	}
 	get value(): UmbTiptapToolbarValue {
-		// TODO: This can be optimized with cashing;
-		return this.#value.map((rows) => rows.map((groups) => [...groups]));
+		return this.#value;
 	}
 	#value: UmbTiptapToolbarValue = [[[]]];
 
@@ -55,6 +56,20 @@ export class UmbPropertyEditorUiTiptapToolbarConfigurationElement
 		});
 	}
 
+	#isValidTiptapToolbarValue(value: unknown): value is UmbTiptapToolbarValue {
+		if (!Array.isArray(value)) return false;
+		for (const row of value) {
+			if (!Array.isArray(row)) return false;
+			for (const group of row) {
+				if (!Array.isArray(group)) return false;
+				for (const alias of group) {
+					if (typeof alias !== 'string') return false;
+				}
+			}
+		}
+		return true;
+	}
+
 	#onDragStart(event: DragEvent, alias: string, fromPos?: [number, number, number]) {
 		event.dataTransfer!.effectAllowed = 'move';
 		this.#currentDragItem = { alias, fromPos };