Sync append enter setting on resume

lib/main.dart

@@ -158,7 +158,7 @@ class InputSyncPage extends StatefulWidget {
 }
 
 class _InputSyncPageState extends State<InputSyncPage>
-    with TickerProviderStateMixin {
+    with TickerProviderStateMixin, WidgetsBindingObserver {
   static const _hostKey = 'server_host';
   static const _portKey = 'server_port';
   static const _historyKey = 'send_history';
@@ -188,6 +188,7 @@ class _InputSyncPageState extends State<InputSyncPage>
   @override
   void initState() {
     super.initState();
+    WidgetsBinding.instance.addObserver(this);
     statusPulseController = AnimationController(
       vsync: this,
       duration: const Duration(milliseconds: 1300),
@@ -206,6 +207,7 @@ class _InputSyncPageState extends State<InputSyncPage>
 
   @override
   void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
     stateSubscription?.cancel();
     statusPulseController.dispose();
     radarPulseController.dispose();
@@ -216,8 +218,16 @@ class _InputSyncPageState extends State<InputSyncPage>
     super.dispose();
   }
 
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (state == AppLifecycleState.resumed) {
+      unawaited(_syncAppendEnterFromPrefs());
+    }
+  }
+
   Future<void> _loadSavedState() async {
     final prefs = await SharedPreferences.getInstance();
+    await prefs.reload();
     final nativeState = await api.getState();
     if (!mounted) {
       return;
@@ -449,6 +459,19 @@ class _InputSyncPageState extends State<InputSyncPage>
     });
   }
 
+  Future<void> _syncAppendEnterFromPrefs() async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.reload();
+    final nextAppendEnter = prefs.getBool(_appendEnterKey) ?? false;
+    if (!mounted || nextAppendEnter == appendEnter) {
+      return;
+    }
+
+    setState(() {
+      appendEnter = nextAppendEnter;
+    });
+  }
+
   void _restoreHistory(String text) {
     inputController.text = text;
     inputController.selection = TextSelection.collapsed(offset: text.length);