Fixed bugs, added serialization for documents state

lib/features/documents/view/widgets/search/text_query_form_field.dart

@@ -28,10 +28,13 @@ class TextQueryFormField extends StatelessWidget {
             prefixIcon: const Icon(Icons.search_outlined),
             labelText: _buildLabelText(context, field.value!.queryType),
             suffixIcon: PopupMenuButton<QueryType>(
-              enabled: !onlyExtendedQueryAllowed,
-              color: onlyExtendedQueryAllowed
-                  ? Theme.of(context).disabledColor
+              icon: onlyExtendedQueryAllowed
+                  ? Icon(
+                      Icons.more_vert,
+                      color: Theme.of(context).disabledColor,
+                    )
                   : null,
+              enabled: !onlyExtendedQueryAllowed,
               itemBuilder: (context) => [
                 PopupMenuItem(
                   child: ListTile(
@@ -59,7 +62,6 @@ class TextQueryFormField extends StatelessWidget {
               onSelected: (selection) {
                 field.didChange(field.value?.copyWith(queryType: selection));
               },
-              child: const Icon(Icons.more_vert),
             ),
           ),
           onChanged: (value) {

lib/features/documents/view/widgets/selection/documents_page_app_bar.dart

@@ -1,3 +1,5 @@
+import 'dart:developer';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:paperless_api/paperless_api.dart';
@@ -36,8 +38,15 @@ class _DocumentsPageAppBarState extends State<DocumentsPageAppBar> {
     return BlocBuilder<DocumentsCubit, DocumentsState>(
       builder: (context, documentsState) {
         final hasSelection = documentsState.selection.isNotEmpty;
+        // final PreferredSize? loadingWidget = documentsState.isLoading
+        //     ? const PreferredSize(
+        //         child: LinearProgressIndicator(),
+        //         preferredSize: Size.fromHeight(4.0),
+        //       )
+        //     : null;
         if (hasSelection) {
           return SliverAppBar(
+            // bottom: loadingWidget,
             expandedHeight: kToolbarHeight + flexibleAreaHeight,
             snap: true,
             floating: true,
@@ -62,6 +71,7 @@ class _DocumentsPageAppBarState extends State<DocumentsPageAppBar> {
           );
         } else {
           return SliverAppBar(
+            // bottom: loadingWidget,
             expandedHeight: kToolbarHeight + flexibleAreaHeight,
             snap: true,
             floating: true,