fix emoji sizing

lib/src/deleted_message.dart

@@ -63,10 +63,7 @@ class DeletedMessage extends StatelessWidget {
               'Message deleted',
               style: messageTheme.messageText.copyWith(
                 fontStyle: FontStyle.italic,
-                color: (Theme.of(context).brightness == Brightness.dark
+                color: messageTheme.createdAt.color,
-                        ? StreamChatTheme.of(context).colorTheme.white
-                        : StreamChatTheme.of(context).colorTheme.black)
-                    .withOpacity(.5),
               ),
             ),
           ),

lib/src/message_widget.dart

@@ -280,9 +280,6 @@ class _MessageWidgetState extends State<MessageWidget> {
     var leftPadding =
         widget.showUserAvatar != DisplayWidget.gone ? avatarWidth + 8.5 : 0.5;
 
-    final isOnlyEmoji =
-        widget.message.text.characters.every((c) => Emoji.byChar(c) != null);
-
     final hasFiles =
         widget.message.attachments?.any((element) => element.type == 'file') ==
             true;
@@ -939,9 +936,16 @@ class _MessageWidgetState extends State<MessageWidget> {
     );
   }
 
+  final _emojis = Emoji.all();
   bool get isOnlyEmoji =>
       widget.message.text.characters.isNotEmpty &&
-      widget.message.text.characters.every((c) => Emoji.byChar(c) != null);
+      widget.message.text.trim().characters.every((c) =>
+          _emojis.firstWhere(
+            (Emoji emoji) => emoji.char.contains(c),
+            orElse: () => null,
+          ) !=
+          null) &&
+      widget.message.text.characters.length < 4;
 
   Color _getBackgroundColor() {
     if (hasQuotedMessage) {