added lint changes, started migrating

packages/stream_chat_flutter/lib/src/message_reactions_modal.dart

@@ -59,7 +59,7 @@ class MessageReactionsModal extends StatelessWidget {
         : (roughSentenceSize == 0 ? 1 : (roughSentenceSize / roughMaxSize));
 
     return TweenAnimationBuilder<double>(
-      tween: Tween(begin: 0.0, end: 1.0),
+      tween: Tween(begin: 0, end: 1),
       duration: Duration(milliseconds: 300),
       curve: Curves.easeInOutBack,
       builder: (context, val, snapshot) {
@@ -86,7 +86,7 @@ class MessageReactionsModal extends StatelessWidget {
                 child: Center(
                   child: SingleChildScrollView(
                     child: Padding(
-                      padding: const EdgeInsets.all(8.0),
+                      padding: const EdgeInsets.all(8),
                       child: Column(
                         mainAxisAlignment: MainAxisAlignment.center,
                         crossAxisAlignment: CrossAxisAlignment.stretch,
@@ -102,7 +102,7 @@ class MessageReactionsModal extends StatelessWidget {
                                       : (divFactor > 1.0
                                           ? 0.0
                                           : -(1.0 - divFactor)),
-                                  0.0),
+                                  0),
                               child: ReactionPicker(
                                 message: message,
                               ),
@@ -121,7 +121,6 @@ class MessageReactionsModal extends StatelessWidget {
                               showReactions: false,
                               showUsername: false,
                               showUserAvatar: showUserAvatar,
-                              showThreadReplyIndicator: false,
                               showTimestamp: false,
                               translateUserAvatar: false,
                               showSendingIndicator: false,
@@ -133,9 +132,8 @@ class MessageReactionsModal extends StatelessWidget {
                               attachmentPadding: EdgeInsets.all(
                                 hasFileAttachment ? 4 : 2,
                               ),
-                              showInChannelIndicator: false,
                               textPadding: EdgeInsets.symmetric(
-                                vertical: 8.0,
+                                vertical: 8,
                                 horizontal:
                                     message.text!.isOnlyEmoji ? 0 : 16.0,
                               ),
@@ -184,7 +182,6 @@ class MessageReactionsModal extends StatelessWidget {
                 child: Wrap(
                   spacing: 16,
                   runSpacing: 16,
-                  alignment: WrapAlignment.start,
                   children: message.latestReactions!
                       .map((e) => _buildReaction(
                             e,
@@ -214,8 +211,6 @@ class MessageReactionsModal extends StatelessWidget {
       )),
       child: Column(
         mainAxisSize: MainAxisSize.min,
-        mainAxisAlignment: MainAxisAlignment.start,
-        crossAxisAlignment: CrossAxisAlignment.center,
         children: [
           Stack(
             clipBehavior: Clip.none,