add community blocking + minor fixes

minor fixes:
* make link preview show up in proper times
* ListTile for (un)blocking communities had a thing switched around

lib/pages/full_post/full_post.dart

@@ -39,8 +39,16 @@ class FullPostPage extends StatelessWidget {
       create: (context) => fullPostStore,
       builder: (context, store) => AsyncStoreListener(
         asyncStore: context.read<FullPostStore>().fullPostState,
+        child: AsyncStoreListener<BlockedCommunity>(
+          asyncStore: context.read<FullPostStore>().communityBlockingState,
+          successMessageBuilder: (context, asyncStore) {
+            final name =
+                asyncStore.data.communityView.community.originPreferredName;
+            return '${asyncStore.data.blocked ? 'Blocked' : 'Unblocked'} $name';
+          },
           child: const _FullPostPage(),
         ),
+      ),
     );
   }
 }
@@ -67,15 +75,9 @@ class _FullPostPage extends HookWidget {
             body: Center(
               child: (store.fullPostState.isLoading)
                   ? const CircularProgressIndicator.adaptive()
-                    : Column(
+                  : FailedToLoad(
-                        children: [
+                      message: 'Post failed to load', refresh: store.refresh),
-                          const Text('Post failed to load'),
+            ),
-                          ElevatedButton.icon(
-                              onPressed: store.refresh,
-                              icon: const Icon(Icons.refresh),
-                              label: const Text('try again'))
-                        ],
-                      )),
           );
         }
 
@@ -114,7 +116,7 @@ class _FullPostPage extends HookWidget {
                 ),
               ),
               actions: [
-                IconButton(icon: const Icon(Icons.share), onPressed: sharePost),
+                IconButton(icon: Icon(shareIcon), onPressed: sharePost),
                 Provider<PostStore>(
                   create: (context) => store.postStore!,
                   child: const SavePostButton(),
@@ -168,12 +170,8 @@ class _Comments extends StatelessWidget {
         } else if (store.fullPostState.errorTerm != null) {
           return Padding(
             padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 30),
-            child: Column(
+            child: FailedToLoad(
-              children: [
+                message: 'Comments failed to load', refresh: store.refresh),
-                const Icon(Icons.error),
-                Text('Error: ${store.fullPostState.errorTerm}')
-              ],
-            ),
           );
         } else {
           return const Padding(
@@ -185,3 +183,26 @@ class _Comments extends StatelessWidget {
     );
   }
 }
+
+class FailedToLoad extends StatelessWidget {
+  final String message;
+  final VoidCallback refresh;
+
+  const FailedToLoad({required this.refresh, required this.message});
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: [
+        Text(message),
+        const SizedBox(height: 5),
+        ElevatedButton.icon(
+          onPressed: refresh,
+          icon: const Icon(Icons.refresh),
+          label: const Text('try again'),
+        )
+      ],
+    );
+  }
+}

lib/widgets/post/full_post_store.dart

@@ -40,10 +40,25 @@ abstract class _FullPostStore with Store {
       postStore ??= PostStore(result.postView);
 
       fullPostView = result;
-      postStore?.postView = result.postView;
+      postStore!.postView = result.postView;
     }
   }
 
+  @action
+  Future<void> blockCommunity(Jwt token) async {
+    final result = await communityBlockingState.runLemmy(
+        instanceHost,
+        BlockCommunity(
+            communityId: fullPostView!.communityView.community.id,
+            block: !fullPostView!.communityView.blocked,
+            auth: token.raw));
+    if (result != null) {
+      fullPostView =
+          fullPostView!.copyWith(communityView: result.communityView);
+    }
+  }
+
+  @action
   void addComment(CommentView commentView) =>
       newComments.insert(0, commentView);
 

lib/widgets/post/full_post_store.g.dart

@@ -76,6 +76,28 @@ mixin _$FullPostStore on _FullPostStore, Store {
     return _$refreshAsyncAction.run(() => super.refresh());
   }
 
+  final _$blockCommunityAsyncAction =
+      AsyncAction('_FullPostStore.blockCommunity');
+
+  @override
+  Future<void> blockCommunity(Jwt token) {
+    return _$blockCommunityAsyncAction.run(() => super.blockCommunity(token));
+  }
+
+  final _$_FullPostStoreActionController =
+      ActionController(name: '_FullPostStore');
+
+  @override
+  void addComment(CommentView commentView) {
+    final _$actionInfo = _$_FullPostStoreActionController.startAction(
+        name: '_FullPostStore.addComment');
+    try {
+      return super.addComment(commentView);
+    } finally {
+      _$_FullPostStoreActionController.endAction(_$actionInfo);
+    }
+  }
+
   @override
   String toString() {
     return '''

lib/widgets/post/post_link_preview.dart

@@ -11,7 +11,8 @@ class PostLinkPreview extends StatelessWidget {
   Widget build(BuildContext context) {
     return ObserverBuilder<PostStore>(
       builder: (context, store) {
-        if (store.postView.post.url == null ||
+        if (store.hasMedia ||
+            store.postView.post.url == null ||
             store.postView.post.url!.isEmpty) {
           return const SizedBox();
         }

lib/widgets/post/post_more_menu.dart

@@ -119,9 +119,14 @@ class PostMoreMenu extends HookWidget {
                           ? const CircularProgressIndicator.adaptive()
                           : const Icon(Icons.block),
                       title: Text(
-                            '${store.fullPostView!.communityView.blocked ? 'Block' : 'Unblock'} community'),
+                          '${store.fullPostView!.communityView.blocked ? 'Unblock' : 'Block'} community'),
+                      onTap: () {
+                        Navigator.of(context).pop();
+                        loggedInAction(store.blockCommunity)();
+                      },
                     );
-                    }),
+                  },
+                ),
               ListTile(
                 leading: const Icon(Icons.info_outline),
                 title: const Text('Nerd stuff'),