Stabilize frontend login. Make chat messages multiline.

frontend/lib/chat_screen.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'app_menu.dart';
 import 'styles.dart';
 import 'backend.dart';
@@ -36,6 +37,7 @@ class _ChatScreenState extends State<ChatScreen> {
   String? _title;
   List<Message> _messages = [];
   final TextEditingController _textController = TextEditingController();
+  final FocusNode _inputFocusNode = FocusNode();
   StreamSubscription? _chatSubscription;
 
   @override
@@ -137,23 +139,36 @@ class _ChatScreenState extends State<ChatScreen> {
           ),
           Padding(
             padding: const EdgeInsets.all(8.0),
-            child: Row(
-              children: [
-                Expanded(
-                  child: TextField(
-                    controller: _textController,
-                    decoration: inputDecoration(),
-                    onSubmitted: sendMessage, // Send message on Enter key
+            child: KeyboardListener(
+              focusNode: _inputFocusNode,
+              onKeyEvent: (event) {
+                // TODO: Probably doing this in the input focus node would be cleaner
+                if (HardwareKeyboard.instance.isControlPressed && HardwareKeyboard.instance.isLogicalKeyPressed(LogicalKeyboardKey.enter)) {
+                  sendMessage(_textController.text);
+                  _textController.clear();
+                  //return KeyEventResult.handled;
+                }
+                //return KeyEventResult.ignored;
+              },
+              child: Column(
+                children: [
+                  Expanded(
+                    child: TextField(
+                      controller: _textController,
+                      maxLines: null,
+                      decoration: inputDecoration(),
+                    ),
                   ),
-                ),
-                SizedBox(width: 8),
-                ElevatedButton(
-                  onPressed: () {
-                    sendMessage(_textController.text);
-                  },
-                  child: Text('Send'),
-                ),
-              ],
+                  SizedBox(width: 8),
+                  ElevatedButton(
+                    onPressed: () {
+                      sendMessage(_textController.text);
+                      _textController.clear();
+                    },
+                    child: Text('Send'),
+                  ),
+                ],
+              ),
             ),
           ),
         ],