fixed texteditingcontroller issues

packages/stream_chat_flutter/lib/src/message_input.dart

@@ -696,13 +696,13 @@ class MessageInputState extends State<MessageInput> {
                 _buildAttachments(),
                 LimitedBox(
                   maxHeight: widget.maxHeight,
-                  child: TextField(
+                  child: StreamMessageTextField(
                     key: const Key('messageInputText'),
                     enabled: _inputEnabled,
                     maxLines: null,
                     onSubmitted: (_) => sendMessage(),
                     keyboardType: widget.keyboardType,
-                    controller: messageInputController.textEditingController,
+                    controller: messageInputController,
                     focusNode: _focusNode,
                     style: _messageInputTheme.inputTextStyle,
                     autofocus: widget.autofocus,
@@ -876,7 +876,7 @@ class MessageInputState extends State<MessageInput> {
             .contains(':')) {
       final textToSelection = messageInputController.text.substring(
         0,
-        messageInputController.textEditingController.value.selection.start,
+        messageInputController.selectionStart,
       );
       final splits = textToSelection.split(':');
       final query = splits[splits.length - 2].toLowerCase();
@@ -1179,15 +1179,14 @@ class MessageInputState extends State<MessageInput> {
   }
 
   Widget _buildMentionsOverlayEntry() {
-    if (messageInputController.textEditingController.value.selection.start <
-        0) {
+    if (messageInputController.selectionStart < 0) {
       return const Offstage();
     }
 
     final splits = messageInputController.text
         .substring(
           0,
-          messageInputController.textEditingController.value.selection.start,
+          messageInputController.selectionStart,
         )
         .split('@');
     final query = splits.last.toLowerCase();
@@ -1223,8 +1222,7 @@ class MessageInputState extends State<MessageInput> {
         messageInputController.textEditingController.value = TextEditingValue(
           text: rejoin +
               messageInputController.text.substring(
-                messageInputController
-                    .textEditingController.value.selection.start,
+                messageInputController.selectionStart,
               ),
           selection: TextSelection.collapsed(
             offset: rejoin.length,
@@ -1267,7 +1265,7 @@ class MessageInputState extends State<MessageInput> {
     messageInputController.textEditingController.value = TextEditingValue(
       text: rejoin +
           messageInputController.text.substring(
-            messageInputController.textEditingController.selection.start,
+            messageInputController.selectionStart,
           ),
       selection: TextSelection.collapsed(
         offset: rejoin.length,
@@ -1794,8 +1792,9 @@ class MessageInputState extends State<MessageInput> {
       text = '${'/${_chosenCommand!.name} '}$text';
     }
 
-    messageInputController.text = '';
-    messageInputController.clearAttachments();
+    messageInputController
+      ..text = ''
+      ..clearAttachments();
     widget.onQuotedMessageCleared?.call();
 
     setState(() {

packages/stream_chat_flutter/lib/src/mip/stream_message_send_button.dart

@@ -0,0 +1 @@
+

packages/stream_chat_flutter/lib/src/mip/stream_message_text_field.dart

@@ -710,17 +710,13 @@ class _StreamMessageTextFieldState extends State<StreamMessageTextField>
     registerForRestoration(_controller!, 'controller');
   }
 
-  late final _onChangedDebounced = debounce(
-    (String newText) => _effectiveController.text = newText,
-    const Duration(milliseconds: 350),
-    leading: true,
-  );
-
   @override
   Widget build(BuildContext context) => TextField(
         key: widget.key,
         controller: _effectiveController.textEditingController,
-        onChanged: (newText) => _onChangedDebounced([newText]),
+        onChanged: (newText) {
+          _effectiveController.text = newText;
+        },
         focusNode: widget.focusNode,
         decoration: widget.decoration,
         keyboardType: widget.keyboardType,
@@ -775,7 +771,6 @@ class _StreamMessageTextFieldState extends State<StreamMessageTextField>
 
   @override
   void dispose() {
-    _onChangedDebounced.cancel();
     _controller?.dispose();
     super.dispose();
   }

packages/stream_chat_flutter/lib/stream_chat_flutter.dart

@@ -28,6 +28,7 @@ export 'src/message_search_item.dart';
 export 'src/message_search_list_view.dart';
 export 'src/message_text.dart';
 export 'src/message_widget.dart';
+export 'src/mip/stream_message_text_field.dart';
 export 'src/option_list_tile.dart';
 export 'src/reaction_icon.dart';
 export 'src/reaction_picker.dart';

packages/stream_chat_flutter_core/lib/src/message_input_controller.dart

@@ -32,16 +32,20 @@ class MessageInputController extends ValueNotifier<Message> {
   final TextEditingController _textEditingController;
 
   ///
-  String get text => value.text ?? '';
+  String get text => _textEditingController.text;
 
   ///
   set message(Message message) {
     value = message;
   }
 
-  set text(String? newText) {
+  set text(String newText) {
     value = value.copyWith(text: newText);
-    _textEditingController.text = newText ?? '';
+    _textEditingController
+      ..text = newText
+      ..selection = TextSelection.fromPosition(
+        TextPosition(offset: _textEditingController.text.length),
+      );
   }
 
   ///
@@ -55,6 +59,11 @@ class MessageInputController extends ValueNotifier<Message> {
     return textEditingController.selection.baseOffset;
   }
 
+  ///
+  get selectionStart {
+    return textEditingController.selection.start;
+  }
+
   set showInChannel(bool newValue) {
     value = value.copyWith(showInChannel: newValue);
   }