Progressing with null safety migration

lib/models/account_image_settings.dart

@@ -7,9 +7,9 @@ import 'package:flutter/widgets.dart';
 enum AccountImageVisibilityLevels { EVERYONE, COMUNIC_USERS, FRIENDS_ONLY }
 
 class AccountImageSettings {
-  final bool hasImage;
-  final String imageURL;
-  final AccountImageVisibilityLevels visibility;
+  final bool/*!*/ hasImage;
+  final String/*!*/ imageURL;
+  final AccountImageVisibilityLevels/*!*/ visibility;
 
   const AccountImageSettings({
     @required this.hasImage,

lib/models/advanced_group_info.dart

@@ -17,7 +17,7 @@ class AdvancedGroupInfo extends Group implements LikeElement {
   int likes;
   bool userLike;
   List<Conversation> conversations;
-  bool isForezGroup;
+  bool/*!*/ isForezGroup;
 
   AdvancedGroupInfo({
     @required int id,

lib/models/advanced_user_info.dart

@@ -11,15 +11,15 @@ import 'package:meta/meta.dart';
 
 class AdvancedUserInfo extends User implements LikeElement {
   final String emailAddress;
-  final String publicNote;
-  final bool canPostTexts;
-  final bool isFriendsListPublic;
-  final int numberFriends;
-  final int accountCreationTime;
-  final String personalWebsite;
+  final String/*!*/ publicNote;
+  final bool/*!*/ canPostTexts;
+  final bool/*!*/ isFriendsListPublic;
+  final int/*!*/ numberFriends;
+  final int/*!*/ accountCreationTime;
+  final String/*!*/ personalWebsite;
   final String location;
-  bool userLike;
-  int likes;
+  bool/*!*/ userLike;
+  int/*!*/ likes;
 
   AdvancedUserInfo({
     @required int id,

lib/models/api_request.dart

@@ -25,8 +25,8 @@ class BytesFile {
 }
 
 class APIRequest {
-  final String uri;
-  final bool needLogin;
+  final String/*!*/ uri;
+  final bool/*!*/ needLogin;
   ProgressCallback progressCallback;
   CancelToken cancelToken;
   Map<String, String> args;

lib/models/api_response.dart

@@ -5,7 +5,7 @@ import 'dart:convert';
 /// @author Pierre HUBERT
 
 class APIResponse {
-  final int code;
+  final int/*!*/ code;
   final String content;
 
   const APIResponse(this.code, this.content) : assert(code != null);

lib/models/application_preferences.dart

@@ -5,9 +5,9 @@ import 'package:flutter/cupertino.dart';
 /// @author Pierre Hubert
 
 class ApplicationPreferences {
-  bool enableDarkMode;
-  bool forceMobileMode;
-  bool showPerformancesOverlay;
+  bool/*!*/ enableDarkMode;
+  bool/*!*/ forceMobileMode;
+  bool/*!*/ showPerformancesOverlay;
 
   ApplicationPreferences({
     @required this.enableDarkMode,

lib/models/authentication_details.dart

@@ -5,8 +5,8 @@ import 'package:meta/meta.dart';
 /// @author Pierre HUBERT
 
 class AuthenticationDetails {
-  final String email;
-  final String password;
+  final String/*!*/ email;
+  final String/*!*/ password;
 
   const AuthenticationDetails({@required this.email, @required this.password})
       : assert(email != null),

lib/models/cache_model.dart

@@ -6,7 +6,7 @@ import 'package:meta/meta.dart';
 /// @author Pierre HUBERT
 
 abstract class CacheModel {
-  final int id;
+  final int/*!*/ id;
 
   const CacheModel({@required this.id}) : assert(id != null);
 

lib/models/call_config.dart

@@ -5,7 +5,7 @@ import 'package:flutter/material.dart';
 /// @author Pierre Hubert
 
 class CallConfig {
-  final List<String> iceServers;
+  final List<String>/*!*/ iceServers;
 
   const CallConfig({
     @required this.iceServers,

lib/models/call_member.dart

@@ -8,8 +8,8 @@ import 'package:flutter_webrtc/flutter_webrtc.dart';
 enum MemberStatus { JOINED, READY }
 
 class CallMember {
-  final int userID;
-  MemberStatus status;
+  final int/*!*/ userID;
+  MemberStatus/*!*/ status;
   MediaStream stream;
 
   CallMember({

lib/models/comment.dart

@@ -11,14 +11,14 @@ import 'package:meta/meta.dart';
 /// @author Pierre HUBERT
 
 class Comment implements LikeElement {
-  final int id;
-  final int userID;
-  final int postID;
-  final int timeSent;
-  DisplayedString content;
+  final int/*!*/ id;
+  final int/*!*/ userID;
+  final int/*!*/ postID;
+  final int/*!*/ timeSent;
+  DisplayedString/*!*/ content;
   final String imageURL;
-  int likes;
-  bool userLike;
+  int/*!*/ likes;
+  bool/*!*/ userLike;
 
   Comment({
     @required this.id,

lib/models/config.dart

@@ -55,7 +55,7 @@ class Config {
         assert(appName != null);
 
   /// Get and set static configuration
-  static Config _config;
+  static Config/*?*/ _config;
 
   static Config get() {
     return _config;
@@ -67,6 +67,6 @@ class Config {
 }
 
 /// Get the current configuration of the application
-Config config() {
+Config/*!*/ config() {
   return Config.get();
 }

lib/models/conversation.dart

@@ -25,15 +25,15 @@ class Conversation extends SerializableElement<Conversation> {
   final bool isHavingCall;
 
   Conversation({
-    @required this.id,
-    @required this.lastActivity,
+    /*required*/ @required this.id,
+    /*required*/ @required this.lastActivity,
     @required this.name,
     @required this.color,
     @required this.logoURL,
     @required this.groupID,
     @required this.groupMinMembershipLevel,
-    @required this.members,
-    @required this.canEveryoneAddMembers,
+    /*required*/ @required this.members,
+    /*required*/ @required this.canEveryoneAddMembers,
     this.callCapabilities = CallCapabilities.NONE,
     this.isHavingCall = false,
   })  : assert(id != null),

lib/models/conversation_member.dart

@@ -5,18 +5,18 @@ import 'package:flutter/widgets.dart';
 /// @author Pierre Hubert
 
 class ConversationMember {
-  final int userID;
-  final int lastMessageSeen;
-  final int lastAccessTime;
-  final bool following;
-  final bool isAdmin;
+  final int/*!*/ userID;
+  final int/*!*/ lastMessageSeen;
+  final int/*!*/ lastAccessTime;
+  final bool/*!*/ following;
+  final bool/*!*/ isAdmin;
 
   const ConversationMember({
-    @required this.userID,
-    @required this.lastMessageSeen,
-    @required this.lastAccessTime,
-    @required this.following,
-    @required this.isAdmin,
+    /*required*/ @required this.userID,
+    /*required*/ @required this.lastMessageSeen,
+    /*required*/ @required this.lastAccessTime,
+    /*required*/ @required this.following,
+    /*required*/ @required this.isAdmin,
   })  : assert(userID != null),
         assert(lastMessageSeen != null),
         assert(lastAccessTime != null),

lib/models/group.dart

@@ -14,7 +14,7 @@ enum GroupMembershipLevel {
   VISITOR
 }
 
-String membershipToText(GroupMembershipLevel level) {
+String/*!*/ membershipToText(GroupMembershipLevel level) {
   switch (level) {
     case GroupMembershipLevel.ADMINISTRATOR:
       return tr("Administrator");