Fix a few notices

lib/ui/dialogs/post_visibility_picker_dialog.dart

@@ -13,10 +13,6 @@ Future<PostVisibilityLevel> showPostVisibilityPickerDialog({
   required PostVisibilityLevel initialLevel,
   required bool isGroup,
 }) async {
-  assert(context != null);
-  assert(initialLevel != null);
-  assert(isGroup != null);
-
   final newLevel = await showDialog<PostVisibilityLevel>(
     context: context,
     builder: (c) => _PostVisibilityPickerWidget(

lib/ui/screens/search_screen.dart

@@ -86,9 +86,7 @@ class _SearchScreenState extends State<SearchScreen> {
 class _SearchResultUser extends StatelessWidget {
   final User user;
 
-  const _SearchResultUser({Key? key, required this.user})
+  const _SearchResultUser({Key? key, required this.user}) : super(key: key);
-      : assert(user != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -105,9 +103,7 @@ class _SearchResultUser extends StatelessWidget {
 class _SearchResultGroup extends StatelessWidget {
   final Group group;
 
-  const _SearchResultGroup({Key? key, required this.group})
+  const _SearchResultGroup({Key? key, required this.group}) : super(key: key);
-      : assert(group != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/screens/update_conversation_screen.dart

@@ -54,7 +54,7 @@ class _UpdateConversationScreen extends State<UpdateConversationScreen> {
   String get _conversationColor => _colorController.text;
 
   Color? get _color {
-    if (_conversationColor == null || _conversationColor.isEmpty) return null;
+    if (_conversationColor.isEmpty) return null;
 
     try {
       return HexColor(_conversationColor);
@@ -237,8 +237,6 @@ class _UpdateConversationScreen extends State<UpdateConversationScreen> {
 
   /// An option of the members menu has been selected
   void _membersMenuItemSelected(User user, _MembersMenuChoices choice) {
-    if (choice == null) return;
-
     switch (choice) {
       case _MembersMenuChoices.REMOVE:
         _removeMember(user);

lib/ui/screens/user_access_denied_screen.dart

@@ -18,8 +18,7 @@ class UserAccessDeniedScreen extends StatefulWidget {
   final int userID;
 
   const UserAccessDeniedScreen({Key? key, required this.userID})
-      : assert(userID != null),
+      : super(key: key);
-        super(key: key);
 
   @override
   _UserAccessDeniedScreenState createState() => _UserAccessDeniedScreenState();

lib/ui/screens/user_page_sections/about_user_section.dart

@@ -21,8 +21,7 @@ class AboutUserSection extends StatefulWidget {
   const AboutUserSection({
     Key? key,
     required this.user,
-  })  : assert(user != null),
+  })  : super(key: key);
-        super(key: key);
 
   @override
   _AboutUserSectionState createState() => _AboutUserSectionState();

lib/ui/screens/user_page_sections/user_page_header.dart

@@ -17,8 +17,7 @@ class UserPageHeader extends StatelessWidget {
     Key? key,
     required this.user,
     required this.bgColor,
-  })  : assert(user != null),
+  }) : super(key: key);
-        super(key: key);
 
   @override
   Widget build(BuildContext context) => Container(

lib/ui/screens/user_page_sections/user_posts_section.dart

@@ -15,8 +15,7 @@ class UserPostsSection extends StatefulWidget {
   const UserPostsSection({
     Key? key,
     required this.user,
-  })  : assert(user != null),
+  })  : super(key: key);
-        super(key: key);
 
   @override
   _UserPostsSectionState createState() => _UserPostsSectionState();

lib/ui/tiles/accepted_friend_tile.dart

@@ -30,12 +30,7 @@ class AcceptedFriendTile extends StatelessWidget {
     required this.onRequestDelete,
     required this.onSetFollowing,
     required this.onOpenPrivateConversation,
-  })  : assert(friend != null),
+  }) : super(key: key);
-        assert(user != null),
-        assert(onRequestDelete != null),
-        assert(onSetFollowing != null),
-        assert(onOpenPrivateConversation != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/tiles/comment_tile.dart

@@ -27,11 +27,7 @@ class CommentTile extends StatelessWidget {
     required this.user,
     required this.onUpdateComment,
     required this.onDeleteComment,
-  })  : assert(comment != null),
+  }) : super(key: key);
-        assert(user != null),
-        assert(onUpdateComment != null),
-        assert(onDeleteComment != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/tiles/conversation_message_tile.dart

@@ -37,12 +37,7 @@ class ConversationMessageTile extends StatelessWidget {
     required this.onRequestMessageStats,
     required this.onRequestMessageUpdate,
     required this.onRequestMessageDelete,
-  })  : assert(message != null),
+  }) : super(key: key);
-        assert(user != null),
-        assert(onRequestMessageStats != null),
-        assert(onRequestMessageUpdate != null),
-        assert(onRequestMessageDelete != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) => Column(
@@ -83,7 +78,7 @@ class ConversationMessageTile extends StatelessWidget {
                         // Update message content
                         PopupMenuItem(
                           enabled: message.isOwner &&
-                              message.message != null &&
+                              !message.message.isNull &&
                               message.message.content!.isNotEmpty,
                           value: _MenuChoices.REQUEST_UPDATE_CONTENT,
                           child: Text(tr("Update")!),

lib/ui/tiles/conversation_tile.dart

@@ -36,12 +36,7 @@ class ConversationTile extends StatelessWidget {
     required this.onOpen,
     required this.onRequestUpdate,
     required this.onRequestLeave,
-  })  : assert(conversation != null),
+  })  : super(key: key);
-        assert(usersList != null),
-        assert(onOpen != null),
-        assert(onRequestUpdate != null),
-        assert(onRequestLeave != null),
-        super(key: key);
 
   _buildSubInformation(IconData icon, String content) {
     return Row(

lib/ui/tiles/pending_friend_tile.dart

@@ -20,10 +20,7 @@ class PendingFriendTile extends StatelessWidget {
       required this.friend,
       required this.user,
       required this.onRespond})
-      : assert(friend != null),
+      : super(key: key);
-        assert(user != null),
-        assert(onRespond != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/tiles/post_tile.dart

@@ -59,13 +59,7 @@ class PostTile extends StatefulWidget {
     required this.showPostTarget,
     required this.groupsInfo,
     required this.userNamesClickable,
-  })  : assert(post != null),
+  }) : super(key: key);
-        assert(usersInfo != null),
-        assert(onDeletedPost != null),
-        assert(showPostTarget != null),
-        assert(groupsInfo != null),
-        assert(userNamesClickable != null),
-        super(key: key);
 
   @override
   State<StatefulWidget> createState() => _PostTileState();
@@ -578,7 +572,7 @@ class _PostTileState extends State<PostTile> {
       isGroup: widget.post.isGroupPost,
     );
 
-    if (newLevel == null || newLevel == widget.post.visibilityLevel) return;
+    if (newLevel == widget.post.visibilityLevel) return;
 
     // Update post visibility
     if (!await _postsHelper.setVisibility(widget.post.id, newLevel)) {

lib/ui/tiles/post_visibility_level_tile.dart

@@ -17,11 +17,7 @@ class PostVisibilityLevelTile extends StatelessWidget {
     required this.title,
     required this.onSelect,
     this.visible = true,
-  })  : assert(level != null),
+  })  : super(key: key);
-        assert(title != null),
-        assert(onSelect != null),
-        assert(visible != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/tiles/server_conversation_message_tile.dart

@@ -14,9 +14,7 @@ class ServerConversationMessageTile extends StatelessWidget {
     Key? key,
     required this.message,
     required this.users,
-  })  : assert(message != null),
+  }) : super(key: key);
-        assert(users != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/tiles/simple_user_tile.dart

@@ -22,8 +22,7 @@ class SimpleUserTile extends StatelessWidget {
     this.onTap,
     this.trailing,
     this.subtitle,
-  })  : assert(user != null),
+  })  : super(key: key);
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/FrienshipStatusWidget.dart

@@ -18,9 +18,7 @@ class FriendshipStatusWidget extends StatefulWidget {
     Key? key,
     required this.status,
     required this.onFriendshipUpdated,
-  })  : assert(status != null),
+  })  : super(key: key);
-        assert(onFriendshipUpdated != null),
-        super(key: key);
 
   @override
   _FriendshipStatusWidgetState createState() => _FriendshipStatusWidgetState();

lib/ui/widgets/account_image_widget.dart

@@ -16,8 +16,7 @@ class AccountImageWidget extends StatelessWidget {
     Key? key,
     required this.user,
     this.width = 35.0,
-  })  : assert(user != null),
+  })  : super(key: key);
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/async_screen_widget.dart

@@ -46,11 +46,7 @@ class AsyncScreenWidget extends StatefulWidget {
     this.showOldDataWhileUpdating = false,
     this.loadingWidget,
     this.errorWidget,
-  })  : assert(onReload != null),
+  })  : super(key: key);
-        assert(onBuild != null),
-        assert(errorMessage != null),
-        assert(showOldDataWhileUpdating != null),
-        super(key: key);
 
   @override
   AsyncScreenWidgetState createState() => AsyncScreenWidgetState();

lib/ui/widgets/conversation_file_tile.dart

@@ -22,9 +22,7 @@ class ConversationFileWidget extends StatefulWidget {
     Key? key,
     required this.messageID,
     required this.file,
-  })  : assert(messageID != null),
+  })  : super(key: key);
-        assert(file != null),
-        super(key: key);
 
   @override
   _ConversationFileWidgetState createState() => _ConversationFileWidgetState();
@@ -101,7 +99,6 @@ class _ConversationFileWidgetState extends State<ConversationFileWidget> {
             ),
           ),
         );
-        break;
     }
   }
 

lib/ui/widgets/conversation_image_widget.dart

@@ -83,9 +83,7 @@ class MultipleAccountImagesWidget extends StatelessWidget {
     Key? key,
     required this.users,
     required this.size,
-  })  : assert(users != null),
+  })  : assert(size > 0),
-        assert(size != null),
-        assert(size > 0),
         super(key: key);
 
   @override

lib/ui/widgets/copy_icon.dart

@@ -10,7 +10,7 @@ import 'package:flutter/material.dart';
 class CopyIcon extends StatelessWidget {
   final String value;
 
-  const CopyIcon(this.value) : assert(value != null);
+  const CopyIcon(this.value);
 
   @override
   Widget build(BuildContext context) {
@@ -18,7 +18,8 @@ class CopyIcon extends StatelessWidget {
       icon: Icon(Icons.content_copy),
       onPressed: () {
         FlutterClipboard.copy(value);
-        snack(context, tr("'%c%' was copied to clipboard", args: {"c": value})!);
+        snack(
+            context, tr("'%c%' was copied to clipboard", args: {"c": value})!);
       },
     );
   }

lib/ui/widgets/countdown_widget.dart

@@ -16,9 +16,7 @@ class CountdownWidget extends StatefulWidget {
     Key? key,
     required this.startTime,
     required this.endTime,
-  })  : assert(startTime != null),
+  })  : super(key: key);
-        assert(endTime != null),
-        super(key: key);
 
   @override
   _CountdownWidgetState createState() => _CountdownWidgetState();

lib/ui/widgets/create_account_widget.dart

@@ -107,7 +107,8 @@ class _CreateAccountWidgetState extends State<CreateAccountWidget> {
                 label: tr("Last name")!,
                 onEdited: _updateUI,
                 icon: Icon(Icons.perm_identity),
-                maxLength: srvConfig!.accountInformationPolicy.maxLastNameLength,
+                maxLength:
+                    srvConfig!.accountInformationPolicy.maxLastNameLength,
                 error: _showErrors && !_isLastNameValid
                     ? tr("Invalid last name!")
                     : null,
@@ -267,11 +268,7 @@ class _InputEntry extends StatelessWidget {
     this.icon,
     this.keyboard,
     this.maxLength,
-  })  : assert(controller != null),
+  }) : super(key: key);
-        assert(label != null),
-        assert(onEdited != null),
-        assert(isPassword != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/custom_list_tile.dart

@@ -41,10 +41,7 @@ class CustomListTile extends StatelessWidget {
     this.onLongPressWithInfo,
     this.onLongPressOpenMenu,
     this.tileColor,
-  })  : assert(isThreeLine != null),
+  })  : assert(!isThreeLine || subtitle != null),
-        assert(enabled != null),
-        assert(selected != null),
-        assert(!isThreeLine || subtitle != null),
         super(key: key);
 
   @override

lib/ui/widgets/dialogs/confirm_dialog_button.dart

@@ -13,8 +13,7 @@ class ConfirmDialogButton<T> extends StatelessWidget {
     Key? key,
     this.enabled = true,
     required this.value,
-  })  : assert(enabled != null),
+  }) : super(key: key);
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/forez_presence_calendar_widget.dart

@@ -26,9 +26,7 @@ class PresenceCalendarWidget extends StatefulWidget {
     this.onDayClicked,
     this.mode = CalendarDisplayMode.SINGLE_USER,
     this.selectedDay,
-  })  : assert(presenceSet != null),
+  }) : super(key: key);
-        assert(mode != null),
-        super(key: key);
 
   @override
   _PresenceCalendarWidgetState createState() => _PresenceCalendarWidgetState();
@@ -148,8 +146,7 @@ class CellWidget extends StatelessWidget {
     this.textColor,
     this.circle = true,
     this.selected,
-  })  : assert(text != null),
+  })  : super(key: key);
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/group_following_widget.dart

@@ -21,9 +21,7 @@ class GroupFollowingWidget extends StatefulWidget {
     required this.onUpdated,
     this.activeColor,
     this.inactiveColor,
-  })  : assert(group != null),
+  }) : super(key: key);
-        assert(onUpdated != null),
-        super(key: key);
 
   @override
   _GroupFollowingWidgetState createState() => _GroupFollowingWidgetState();
@@ -46,7 +44,8 @@ class _GroupFollowingWidgetState extends SafeState<GroupFollowingWidget> {
             color: _group.following ? widget.activeColor : widget.inactiveColor,
           )),
           TextSpan(
-              text: "  " + (_group.following ? tr("Following")! : tr("Follow")!)),
+              text:
+                  "  " + (_group.following ? tr("Following")! : tr("Follow")!)),
         ]),
       ),
       onTap: () => _toggleFollowing(),

lib/ui/widgets/group_icon_widget.dart

@@ -13,9 +13,7 @@ class GroupIcon extends StatelessWidget {
     Key? key,
     required this.group,
     this.width = 50,
-  })  : assert(group != null),
+  }) : super(key: key);
-        assert(width != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/like_widget.dart

@@ -25,8 +25,7 @@ class LikeWidget extends StatefulWidget {
       this.buttonIconSize = 15.0,
       this.activeColor,
       this.inativeColor})
-      : assert(likeElement != null),
+      : super(key: key);
-        super(key: key);
 
   @override
   _LikeWidgetState createState() => _LikeWidgetState();

lib/ui/widgets/post_container_widget.dart

@@ -7,9 +7,7 @@ import 'package:flutter/material.dart';
 class PostContainer extends StatelessWidget {
   final Widget child;
 
-  const PostContainer({Key? key, required this.child})
+  const PostContainer({Key? key, required this.child}) : super(key: key);
-      : assert(child != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/settings/multi_choices_settings_tile.dart

@@ -22,10 +22,7 @@ class MultiChoicesSettingsTile<T> extends SettingsTile {
     required this.onChanged,
     this.leading,
     this.trailing,
-  })  : assert(title != null),
+  }) : assert(currentValue != null);
-        assert(choices != null),
-        assert(currentValue != null),
-        assert(onChanged != null);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/status_widget.dart

@@ -17,8 +17,7 @@ class StatusWidget extends StatefulWidget {
   const StatusWidget({
     Key? key,
     required this.child,
-  })  : assert(child != null),
+  })  : super(key: key);
-        super(key: key);
 
   @override
   StatusWidgetState createState() => StatusWidgetState();

lib/ui/widgets/tablet_mode/user_page_tablet.dart

@@ -216,9 +216,7 @@ class _LeftPaneContainer extends StatelessWidget {
 class _MainCardSpacer extends StatelessWidget {
   final bool visible;
 
-  const _MainCardSpacer({this.visible = true, Key? key})
+  const _MainCardSpacer({this.visible = true, Key? key}) : super(key: key);
-      : assert(visible != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) =>
@@ -239,10 +237,7 @@ class _AboutUserEntry extends StatelessWidget {
     required this.value,
     this.visible = true,
     this.parsed = false,
-  })  : assert(icon != null),
+  }) : super(key: key);
-        assert(title != null),
-        assert(visible != null),
-        super(key: key);
 
   @override
   Widget build(BuildContext context) {

lib/ui/widgets/tour/presentation_pane.dart

@@ -29,7 +29,6 @@ class PresentationPane extends StatelessWidget {
     this.onTapNext,
     this.visible = true,
   })  : assert(icon != null || iconWidget != null),
-        assert(title != null),
         assert(text != null || child != null),
         super(key: key);
 
@@ -41,7 +40,9 @@ class PresentationPane extends StatelessWidget {
       return Column(
         children: <Widget>[
           Spacer(flex: 3),
-          icon != null ? Icon(icon, color: Colors.white, size: 50) : iconWidget!,
+          icon != null
+              ? Icon(icon, color: Colors.white, size: 50)
+              : iconWidget!,
           Spacer(flex: 1),
           Text(
             title,