msglist: Move message sender widget to local variable

Author: sirpengi

lib/widgets/message_list.dart

@@ -783,6 +783,37 @@ class MessageWithPossibleSender extends StatelessWidget {
     final time = _kMessageTimestampFormat
       .format(DateTime.fromMillisecondsSinceEpoch(1000 * message.timestamp));
 
+    final Widget senderWidget;
+    if (item.showSender) {
+      senderWidget = Column(
+        children: [
+          const SizedBox(height: 3),
+          GestureDetector(
+            onTap: () => Navigator.push(context,
+              ProfilePage.buildRoute(context: context,
+                userId: message.senderId)),
+            child: Row(
+              children: [
+                Avatar(size: 32, borderRadius: 3, userId: message.senderId),
+                const SizedBox(width: 8),
+                Flexible(
+                  child: Text(message.senderFullName, // TODO get from user data
+                    style: const TextStyle(
+                      fontFamily: 'Source Sans 3',
+                      fontSize: 18,
+                      height: (22 / 18),
+                    ).merge(weightVariableTextStyle(context, wght: 600,
+                        wghtIfPlatformRequestsBold: 900)),
+                    overflow: TextOverflow.ellipsis),
+                ),
+              ])),
+          const SizedBox(height: 4),
+        ],
+      );
+    } else {
+      senderWidget = const SizedBox.shrink();
+    }
+
     return GestureDetector(
       behavior: HitTestBehavior.translucent,
       onLongPress: () => showMessageActionSheet(context: context, message: message),
@@ -794,29 +825,7 @@ class MessageWithPossibleSender extends StatelessWidget {
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.stretch,
               children: [
-                if (item.showSender) ...[
-                  const SizedBox(height: 3),
-                  GestureDetector(
-                    onTap: () => Navigator.push(context,
-                      ProfilePage.buildRoute(context: context,
-                        userId: message.senderId)),
-                    child: Row(
-                      children: [
-                        Avatar(size: 32, borderRadius: 3, userId: message.senderId),
-                        const SizedBox(width: 8),
-                        Flexible(
-                          child: Text(message.senderFullName, // TODO get from user data
-                            style: const TextStyle(
-                              fontFamily: 'Source Sans 3',
-                              fontSize: 18,
-                              height: (22 / 18),
-                            ).merge(weightVariableTextStyle(context, wght: 600,
-                                      wghtIfPlatformRequestsBold: 900)),
-                            overflow: TextOverflow.ellipsis),
-                        ),
-                      ])),
-                  const SizedBox(height: 4),
-                ],
+                senderWidget,
                 MessageContent(message: message, content: item.content),
                 if ((message.reactions?.total ?? 0) > 0)
                   ReactionChipsList(messageId: message.id, reactions: message.reactions!)