Fix all warnings

lib/ui/routes/push_notifications_route.dart

@@ -51,7 +51,7 @@ class _PushNotificationsConfigurationRouteState
                 ),
                 Spacer(),
                 OutlinedButton(
-                    onPressed: _key?.currentState?.canSubmit ?? false
+                    onPressed: _key.currentState?.canSubmit ?? false
                         ? _key.currentState!.submit
                         : null,
                     child: Text(tr("Configure")!.toUpperCase()),

lib/ui/routes/tour_route.dart

@@ -123,7 +123,7 @@ class TourRouteState extends State<TourRoute> {
     ..removeWhere((pane) {
       if (pane is PresentationPane) {
         PresentationPane p = pane;
-        return !(p.visible ?? true);
+        return !(p.visible);
       }
       return false;
     });
@@ -222,7 +222,7 @@ class __RouteBodyState extends State<_RouteBody> {
 
       _controller!.animateTo(_controller!.index + 1);
     } else {
-      (await PreferencesHelper.getInstance())!
+      (await PreferencesHelper.getInstance())
           .setBool(PreferencesKeyList.IS_TOUR_SEEN, true);
       Navigator.of(context).pop();
     }

lib/ui/screens/notifications_screen.dart

@@ -316,6 +316,9 @@ class _NotificationTile extends StatelessWidget {
       case _PopupMenuActions.DELETE:
         onDelete(notification);
         break;
+
+      default:
+        break;
     }
   }
 

lib/ui/screens/other_friends_lists_screen.dart

@@ -88,7 +88,7 @@ class _OtherUserFriendsListScreenState
           user: _usersInfo!.getUser(_friendsList.elementAt(i)),
           onTap: (u) => openUserPage(
             context: context,
-            userID: u.id!,
+            userID: u.id,
           ),
         ),
       ),

lib/ui/screens/search_screen.dart

@@ -97,7 +97,7 @@ class _SearchResultUser extends StatelessWidget {
         user: user,
       ),
       title: Text(user.displayName),
-      onTap: () => MainController.of(context)!.openUserPage(user.id!),
+      onTap: () => MainController.of(context)!.openUserPage(user.id),
     );
   }
 }

lib/ui/screens/unread_conversations_screen.dart

@@ -102,7 +102,7 @@ class _UnreadConversationsScreenState
             ? _groups!.getGroup(conv.conv.groupID)
             : null,
       ),
-      title: Text(ConversationsHelper.getConversationName(conv.conv, _users)!),
+      title: Text(ConversationsHelper.getConversationName(conv.conv, _users)),
       subtitle: RichText(
         text: TextSpan(style: Theme.of(context).textTheme.bodyText2, children: [
           TextSpan(

lib/ui/screens/update_conversation_screen.dart

@@ -282,7 +282,7 @@ class _UpdateConversationScreen extends State<UpdateConversationScreen> {
   void _toggleAdminStatus(User user) async {
     try {
       final setAdmin = !_admins.contains(user.id);
-      await ConversationsHelper.setAdmin(_conversation.id!, user.id!, setAdmin);
+      await ConversationsHelper.setAdmin(_conversation.id!, user.id, setAdmin);
 
       setState(() {
         if (!setAdmin)

lib/ui/tiles/accepted_friend_tile.dart

@@ -40,7 +40,7 @@ class AcceptedFriendTile extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return ListTile(
-      onTap: () => openUserPage(context: context, userID: user.id!),
+      onTap: () => openUserPage(context: context, userID: user.id),
       leading: AccountImageWidget(user: user),
       title: Text(user.displayName),
       subtitle: friend.isConnected

lib/ui/tiles/conversation_message_tile.dart

@@ -64,7 +64,7 @@ class ConversationMessageTile extends StatelessWidget {
                       onSelected: (v) => _menuOptionSelected(context, v),
                       itemBuilder: (c) => <PopupMenuItem<_MenuChoices>>[
                         PopupMenuItem(
-                          enabled: (message.message?.content ?? "") != "",
+                          enabled: (message.message.content ?? "") != "",
                           value: _MenuChoices.COPY_MESSAGE,
                           child: Text(tr("Copy message")!),
                         ),

lib/ui/tiles/conversation_tile.dart

@@ -68,7 +68,7 @@ class ConversationTile extends StatelessWidget {
           ConversationsHelper.getConversationName(
             conversation,
             usersList,
-          )!,
+          ),
           style: TextStyle(
             fontWeight: conversation.sawLastMessage ? null : FontWeight.bold,
           ),
@@ -162,6 +162,9 @@ class ConversationTile extends StatelessWidget {
       case _PopupMenuChoices.LEAVE:
         onRequestLeave(conversation);
         break;
+
+      default:
+        break;
     }
   }
 }

lib/ui/tiles/post_tile.dart

@@ -114,7 +114,7 @@ class _PostTileState extends State<PostTile> {
             child: AccountImageWidget(user: _user),
             onTap: widget.userNamesClickable
                 ? () => openUserPage(
-                      userID: _user.id!,
+                      userID: _user.id,
                       context: context,
                     )
                 : null,

lib/ui/widgets/account_image_widget.dart

@@ -23,7 +23,7 @@ class AccountImageWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Material(
       child: CachedNetworkImage(
-        imageUrl: user.accountImageURL!,
+        imageUrl: user.accountImageURL,
         width: width,
         height: width,
         fit: BoxFit.cover,

lib/ui/widgets/mobile_mode/mobile_appbar_widget.dart

@@ -217,6 +217,8 @@ class _ComunicMobileAppBarState extends SafeState<ComunicMobileAppBar> {
       case BarCallbackActions.ACTION_LOGOUT:
         controller!.requestLogout();
         break;
+      default:
+        break;
     }
   }
 }

lib/ui/widgets/tablet_mode/global_search_field.dart

@@ -169,7 +169,7 @@ class _SearchResultsWidget extends StatelessWidget {
           leading: AccountImageWidget(user: user),
           title: Text(user.displayName),
           onTap: () {
-            MainController.of(context)!.openUserPage(user.id!);
+            MainController.of(context)!.openUserPage(user.id);
             onTap();
           },
         );
@@ -185,6 +185,5 @@ class _SearchResultsWidget extends StatelessWidget {
           },
         );
     }
-    throw Exception("Unreachable statement!");
   }
 }

lib/ui/widgets/tablet_mode/memberships_panel.dart

@@ -105,8 +105,6 @@ class _MembershipsPanelState extends SafeState<MembershipsPanel> {
       case MembershipType.CONVERSATION:
         return _buildConversationMembership(membership);
     }
-
-    throw Exception("Unreachable statement!");
   }
 
   // TODO : add private messages icon support
@@ -156,7 +154,7 @@ class _MembershipsPanelState extends SafeState<MembershipsPanel> {
         leading: AccountImageWidget(user: user, width: _MembershipIconsWidth),
         title: Text(user.displayName),
         subtitle: subtitle,
-        onTap: () => MainController.of(context)!.openUserPage(user.id!),
+        onTap: () => MainController.of(context)!.openUserPage(user.id),
       ),
     );
   }
@@ -237,7 +235,7 @@ class _MembershipsPanelState extends SafeState<MembershipsPanel> {
             SizedBox(width: 5),
             Expanded(
               child: Text(ConversationsHelper.getConversationName(
-                  conversation, _usersList)!),
+                  conversation, _usersList)),
             ),
           ],
         ),

lib/ui/widgets/tour/tour_notifications_pane.dart

@@ -27,7 +27,7 @@ class TourNotificationsPane extends PresentationPane {
             onConfigured: onConfigured,
             onChanged: onChanged,
           ),
-          canGoNext: pushNotificationsKey?.currentState?.canSubmit ?? false,
+          canGoNext: pushNotificationsKey.currentState?.canSubmit ?? false,
           onTapNext: (c) => pushNotificationsKey.currentState!.submit(),
           visible: visible,
         );