Continue to fix deprecation warnings

lib/ui/screens/user_access_denied_screen.dart

@@ -61,7 +61,7 @@ class _UserAccessDeniedScreenState extends SafeState<UserAccessDeniedScreen> {
   Widget _buildPage() {
     final size = MediaQuery.of(context).size;
     return Container(
-      constraints: BoxConstraints.loose(size),
+      width: size.width,
       child: SingleChildScrollView(
         child: Padding(
           padding: const EdgeInsets.all(8.0),

lib/ui/tiles/post_tile.dart

@@ -25,6 +25,7 @@ import 'package:comunic/utils/navigation_utils.dart';
 import 'package:comunic/utils/post_utils.dart';
 import 'package:comunic/utils/ui_utils.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
 import 'package:image_picker/image_picker.dart';
 import 'package:url_launcher/url_launcher.dart';
 
@@ -264,9 +265,9 @@ class _PostTileState extends State<PostTile> {
   }
 
   Widget _buildPostYouTube() {
-    return RaisedButton(
-      color: Colors.red,
-      textColor: Colors.white,
+    return ElevatedButton(
+      style:
+          ButtonStyle(backgroundColor: MaterialStateProperty.all(Colors.red)),
       child: Row(
         mainAxisSize: MainAxisSize.min,
         children: <Widget>[
@@ -321,7 +322,7 @@ class _PostTileState extends State<PostTile> {
   }
 
   Widget _buildPostPDF() {
-    return RaisedButton.icon(
+    return ElevatedButton.icon(
       onPressed: () {
         launch(widget.post.fileURL);
       },
@@ -442,8 +443,7 @@ class _PostTileState extends State<PostTile> {
           // Image button
           Container(
             width: 30,
-            child: FlatButton(
-              padding: EdgeInsets.only(),
+            child: TextButton(
               onPressed: _pickImageForComment,
               child: Icon(
                 Icons.image,
@@ -455,8 +455,7 @@ class _PostTileState extends State<PostTile> {
           // Submit button
           Container(
             width: 40,
-            child: FlatButton(
-              padding: EdgeInsets.only(),
+            child: TextButton(
               onPressed: _canSubmitComment ? () => _submitComment() : null,
               child: Icon(
                 Icons.send,

lib/ui/widgets/FrienshipStatusWidget.dart

@@ -47,7 +47,7 @@ class _FriendshipStatusWidgetState extends State<FriendshipStatusWidget> {
 
     // No request sent yet
     if (widget.status.noRequestExchanged) {
-      return RaisedButton(
+      return ElevatedButton(
         child: Text(tr("Send request").toUpperCase()),
         onPressed: () =>
             executeRequest(() => _friendsHelper.sendRequest(friendID)),
@@ -56,12 +56,13 @@ class _FriendshipStatusWidgetState extends State<FriendshipStatusWidget> {
 
     // Already sent a friendship request
     if (widget.status.sentRequest) {
-      return RaisedButton(
+      return ElevatedButton(
         child: Text(
           tr("Cancel request").toUpperCase(),
           style: WhiteTextColorStyle,
         ),
-        color: Colors.red,
+        style:
+            ButtonStyle(backgroundColor: MaterialStateProperty.all(Colors.red)),
         onPressed: () =>
             executeRequest(() => _friendsHelper.cancelRequest(friendID)),
       );
@@ -94,7 +95,7 @@ class _FriendshipStatusWidgetState extends State<FriendshipStatusWidget> {
     }
 
     // The two users are friends, offers to follow him
-    return RaisedButton(
+    return ElevatedButton(
       child: Text((widget.status.following ? tr("Following") : tr("Follow"))
           .toUpperCase()),
       onPressed: () => executeRequest(() =>

lib/ui/widgets/init_widget.dart

@@ -153,8 +153,7 @@ class _InitializeWidgetState extends SafeState<InitializeWidget> {
         SizedBox(
           height: 30,
         ),
-        RaisedButton(
-          color: Colors.indigo,
+        ElevatedButton(
           onPressed: () => _tryConnect(),
           child: Text(tr("Try again")),
         ),

lib/ui/widgets/tablet_mode/user_page_tablet.dart

@@ -135,7 +135,7 @@ class _UserPageTabletState extends State<UserPageTablet> {
               // Private messages
               !_isCurrentUser
                   ? Expanded(
-                      child: OutlineButton(
+                      child: OutlinedButton(
                       onPressed: () =>
                           openPrivateConversation(context, _userInfo.id),
                       child: Icon(Icons.message),