emoji [nfc]: Pull out textEmojiForEmojiName helper

Author: chrisbobbe

lib/widgets/emoji.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 
+import '../api/model/model.dart';
 import '../model/emoji.dart';
 import 'content.dart';
 
@@ -146,3 +147,13 @@ class ImageEmojiWidget extends StatelessWidget {
       resolvedUrl);
   }
 }
+
+/// The text to display for an emoji in the "Plain text" emoji theme.
+///
+/// See [Emojiset.text].
+String textEmojiForEmojiName(String emojiName) {
+  // Encourage line breaks before "_" (common in these), but try not
+  // to leave a colon alone on a line. See:
+  //   <https://github.com/flutter/flutter/issues/61081#issuecomment-1103330522>
+  return ':\ufeff${emojiName.replaceAll('_', '\u200b_')}\ufeff:';
+}

lib/widgets/emoji_reaction.dart

@@ -382,13 +382,6 @@ class _TextEmoji extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final emojiName = emojiDisplay.emojiName;
-
-    // Encourage line breaks before "_" (common in these), but try not
-    // to leave a colon alone on a line. See:
-    //   <https://github.com/flutter/flutter/issues/61081#issuecomment-1103330522>
-    final text = ':\ufeff${emojiName.replaceAll('_', '\u200b_')}\ufeff:';
-
     final reactionTheme = EmojiReactionTheme.of(context);
     return Text(
       textAlign: TextAlign.end,
@@ -400,7 +393,7 @@ class _TextEmoji extends StatelessWidget {
         color: selected ? reactionTheme.textSelected : reactionTheme.textUnselected,
       ).merge(weightVariableTextStyle(context,
           wght: selected ? 600 : null)),
-      text);
+      textEmojiForEmojiName(emojiDisplay.emojiName));
   }
 }