opt.: linux/win window size & server reconnect

lib/data/model/app/rebuild.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/foundation.dart';
+
+// ignore: prefer_void_to_null
+class RebuildNode implements ValueListenable<Null> {
+  final List<VoidCallback> _listeners = [];
+
+  RebuildNode();
+
+  @override
+  void addListener(VoidCallback listener) {
+    _listeners.add(listener);
+  }
+
+  @override
+  void removeListener(VoidCallback listener) {
+    _listeners.remove(listener);
+  }
+
+  void rebuild() {
+    for (var listener in _listeners) {
+      listener();
+    }
+  }
+
+  @override
+  Null get value => null;
+}

lib/data/model/server/server.dart

@@ -10,6 +10,10 @@ class Server implements TagPickable {
   SSHClient? client;
   ServerState state;
 
+  /// Whether is generating client. 
+  /// Use this to avoid reconnecting if last connect try not finished.
+  bool isGenerating = false;
+
   Server(this.spi, this.status, this.client, this.state);
 
   @override