improved performance and battery usage on older devices

lib/view/pages/talk/widgets/chat_textfield.dart

@@ -83,12 +83,20 @@ class _ChatTextfieldState extends State<ChatTextfield> {
     );
   }
 
+  /// Called per keystroke, so the text itself is saved silently; only a draft
+  /// appearing or disappearing notifies listeners (the chat list's marker).
   void _setDraft(String text) {
-    final talkSettings = settings.val(write: true).talkSettings;
+    final drafts = settings.val().talkSettings.drafts;
+    final hadDraft = drafts.containsKey(widget.sendToToken);
     if (text.isNotEmpty) {
-      talkSettings.drafts[widget.sendToToken] = text;
+      drafts[widget.sendToToken] = text;
     } else {
-      talkSettings.drafts.removeWhere((key, _) => key == widget.sendToToken);
+      drafts.remove(widget.sendToToken);
+    }
+    if (hadDraft != text.isNotEmpty) {
+      settings.val(write: true);
+    } else {
+      settings.saveSilently();
     }
   }
 
@@ -276,17 +284,22 @@ class _ChatTextfieldState extends State<ChatTextfield> {
 
   @override
   Widget build(BuildContext context) {
-    final chatBloc = context.watch<ChatBloc>();
-    final chatState = chatBloc.state.data;
+    final chatBloc = context.read<ChatBloc>();
+    // Only the reply reference is rendered from the chat state; loading flags
+    // and paging emits don't need to rebuild the input.
+    final (referenceMessageId, chatResponse) = context.select(
+      (ChatBloc b) => (
+        b.state.data?.referenceMessageId,
+        b.state.data?.chatResponse,
+      ),
+    );
 
     Widget replyBanner = const SizedBox.shrink();
-    if (chatState != null &&
-        chatState.referenceMessageId != null &&
-        chatState.chatResponse != null) {
+    if (referenceMessageId != null && chatResponse != null) {
       try {
-        final referenceMessage = chatState.chatResponse!
-            .sortByTimestamp()
-            .firstWhere((e) => e.id == chatState.referenceMessageId);
+        final referenceMessage = chatResponse.data.firstWhere(
+          (e) => e.id == referenceMessageId,
+        );
         replyBanner = Row(
           children: [
             Expanded(