align with master

example/ios/Podfile.lock

@@ -284,4 +284,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: eb001256612a59f8f9e4d083ad8b9671e69dd184
 
-COCOAPODS: 1.10.0.rc.1
+COCOAPODS: 1.10.0

example/pubspec.yaml

@@ -1,6 +1,6 @@
 name: example
 description: A new Flutter project.
-version: 1.0.71+73
+version: 1.0.72+74
 
 environment:
   sdk: ">=2.2.2 <3.0.0"

lib/src/message_input.dart

@@ -428,26 +428,36 @@ class MessageInputState extends State<MessageInput> {
     );
   }
 
+  Timer _debounce;
   void _onChanged(BuildContext context, String s) {
-    StreamChannel.of(context).channel.keyStroke().catchError((e) {});
+    if (_debounce?.isActive == true) _debounce.cancel();
+    _debounce = Timer(
+      const Duration(milliseconds: 350),
+      () {
+        if (!mounted) {
+          return;
+        }
+        StreamChannel.of(context).channel.keyStroke().catchError((e) {});
 
-    setState(() {
-      _messageIsPresent = s.trim().isNotEmpty;
-      _actionsShrunk = s.trim().isNotEmpty;
-    });
+        setState(() {
+          _messageIsPresent = s.trim().isNotEmpty;
+          _actionsShrunk = s.trim().isNotEmpty;
+        });
 
-    _commandsOverlay?.remove();
-    _commandsOverlay = null;
-    _mentionsOverlay?.remove();
-    _mentionsOverlay = null;
-    _emojiOverlay?.remove();
-    _emojiOverlay = null;
+        _commandsOverlay?.remove();
+        _commandsOverlay = null;
+        _mentionsOverlay?.remove();
+        _mentionsOverlay = null;
+        _emojiOverlay?.remove();
+        _emojiOverlay = null;
 
-    _checkCommands(s.trim(), context);
+        _checkCommands(s.trim(), context);
 
-    _checkMentions(s, context);
+        _checkMentions(s, context);
 
-    _checkEmoji(s, context);
+        _checkEmoji(s, context);
+      },
+    );
   }
 
   String _getHint() {