fix(ui): enable sending reply in threads for users with sendReply capability (#2385)

Author: xsahil03x

packages/stream_chat_flutter/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 🐞 Fixed
 
+- Fixed users with `sendReply` capability unable to send replies in threads.
 - Fixed delete/flag message dialogs executing action when dialog is dismissed without confirmation.
 
 ## Upcoming

packages/stream_chat_flutter/lib/src/message_input/stream_message_input.dart

@@ -619,6 +619,12 @@ class StreamMessageInputState extends State<StreamMessageInput>
   Widget build(BuildContext context) {
     bool canSendOrUpdateMessage(List<ChannelCapability> capabilities) {
       var result = capabilities.contains(ChannelCapability.sendMessage);
+
+      final insideThread = _effectiveController.message.parentId != null;
+      if (insideThread) {
+        result |= capabilities.contains(ChannelCapability.sendReply);
+      }
+
       if (_isEditing) {
         result |= capabilities.contains(ChannelCapability.updateOwnMessage);
         result |= capabilities.contains(ChannelCapability.updateAnyMessage);