small fixes & tweaks

* commenting uses mobx instead of hooks
* SavePostButton works with fullPost
* `is AsyncStateX` -> .errorTerm & .isLoading
* save post button better looking spinner

lib/pages/full_post/full_post.dart

@@ -8,7 +8,6 @@ import 'package:lemmy_api_client/v3.dart';
 import 'package:provider/provider.dart';
 
 import '../../hooks/logged_in_action.dart';
-import '../../util/async_store.dart';
 import '../../util/async_store_listener.dart';
 import '../../util/extensions/api.dart';
 import '../../util/icons.dart';
@@ -20,6 +19,7 @@ import '../../widgets/post/full_post_store.dart';
 import '../../widgets/post/post.dart';
 import '../../widgets/post/post_more_menu.dart';
 import '../../widgets/post/post_store.dart';
+import '../../widgets/post/save_post_button.dart';
 import '../../widgets/reveal_after_scroll.dart';
 import '../../widgets/write_comment.dart';
 
@@ -57,7 +57,6 @@ class _FullPostPage extends HookWidget {
 
     final loggedInAction = useLoggedInAction(
         context.select<FullPostStore, String>((store) => store.instanceHost));
-    final newComments = useState(const <CommentView>[]);
 
     return ObserverBuilder<FullPostStore>(
       builder: (context, store) {
@@ -97,8 +96,9 @@ class _FullPostPage extends HookWidget {
             context: context,
             builder: (_) => WriteComment.toPost(post.post),
           );
+
           if (newComment != null) {
-            newComments.value = [...newComments.value, newComment];
+            store.addComment(newComment);
           }
         }
 
@@ -115,7 +115,10 @@ class _FullPostPage extends HookWidget {
               ),
               actions: [
                 IconButton(icon: const Icon(Icons.share), onPressed: sharePost),
-                // const SavePostButton(),
+                Provider<PostStore>(
+                  create: (context) => store.postStore!,
+                  child: const SavePostButton(),
+                ),
                 IconButton(
                   icon: Icon(moreIcon),
                   onPressed: () => showPostMoreMenu(
@@ -160,7 +163,7 @@ class _Comments extends StatelessWidget {
         if (fullPost != null) {
           return CommentSection(store.comments!,
               postCreatorId: fullPost.postView.creator.id);
-        } else if (store.fullPostState is AsyncStateError) {
+        } else if (store.fullPostState.errorTerm != null) {
           return Padding(
             padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 30),
             child: Column(

lib/widgets/post/post_voting.dart

@@ -5,7 +5,6 @@ import 'package:provider/provider.dart';
 
 import '../../hooks/logged_in_action.dart';
 import '../../hooks/stores.dart';
-import '../../util/async_store.dart';
 import '../../util/intl.dart';
 import '../../util/observer_consumers.dart';
 import 'post_store.dart';
@@ -33,7 +32,7 @@ class PostVoting extends HookWidget {
             ),
             onPressed: loggedInAction(store.upVote),
           ),
-          if (store.votingState is AsyncStateLoading)
+          if (store.votingState.isLoading)
             const SizedBox(
                 width: 20, height: 20, child: CircularProgressIndicator())
           else if (showScores)

lib/widgets/post/save_post_button.dart

@@ -3,7 +3,6 @@ import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:provider/provider.dart';
 
 import '../../hooks/logged_in_action.dart';
-import '../../util/async_store.dart';
 import '../../util/observer_consumers.dart';
 import 'post_store.dart';
 
@@ -19,25 +18,14 @@ class SavePostButton extends HookWidget {
 
     return ObserverBuilder<PostStore>(
       builder: (context, store) {
-        if (store.savingState is AsyncStateLoading) {
-          return Padding(
-            padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 5),
-            child: SizedBox(
-              width: 30,
-              height: 30,
-              child: CircularProgressIndicator(
-                backgroundColor: Theme.of(context).iconTheme.color,
-              ),
-            ),
-          );
-        }
-
         final savedIcon =
             store.postView.saved ? Icons.bookmark : Icons.bookmark_border;
 
         return IconButton(
           tooltip: 'Save post',
-          icon: Icon(savedIcon),
+          icon: store.savingState.isLoading
+              ? const CircularProgressIndicator.adaptive()
+              : Icon(savedIcon),
           onPressed: loggedInAction(store.save),
         );
       },