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

@@ -428,7 +428,15 @@ class MessageInputState extends State<MessageInput> {
     );
   }
 
+  Timer _debounce;
   void _onChanged(BuildContext context, String s) {
+    if (_debounce?.isActive == true) _debounce.cancel();
+    _debounce = Timer(
+      const Duration(milliseconds: 350),
+      () {
+        if (!mounted) {
+          return;
+        }
         StreamChannel.of(context).channel.keyStroke().catchError((e) {});
 
         setState(() {
@@ -448,6 +456,8 @@ class MessageInputState extends State<MessageInput> {
         _checkMentions(s, context);
 
         _checkEmoji(s, context);
+      },
+    );
   }
 
   String _getHint() {