[editor] Disable the editor-buttons in XFA documents

Given the differences between XFA documents and "normal" PDF documents, we don't support editing of the former ones. Hence, when a XFA-document is opened, we temporarily disable the editor-buttons.

web/base_viewer.js

@@ -359,6 +359,13 @@ class BaseViewer {
     return this.#annotationMode === AnnotationMode.ENABLE_FORMS;
   }
 
+  /**
+   * @type {boolean}
+   */
+  get enableAnnotationEditor() {
+    return !!this.#annotationEditorUIManager;
+  }
+
   /**
    * @type {boolean}
    */
@@ -719,9 +726,8 @@ class BaseViewer {
         const annotationLayerFactory =
           this.#annotationMode !== AnnotationMode.DISABLE ? this : null;
         const xfaLayerFactory = isPureXfa ? this : null;
-        const annotationEditorLayerFactory = this.#annotationEditorUIManager
-          ? this
-          : null;
+        const annotationEditorLayerFactory =
+          this.#annotationEditorUIManager && !isPureXfa ? this : null;
 
         for (let pageNum = 1; pageNum <= pagesCount; ++pageNum) {
           const pageView = new PDFPageView({