opt: ui & cursor

- opt: win7 frameless
- opt: disable cursor output & macos free cache
- opt: main window, set location before show/hide

flutter/lib/main.dart

@@ -118,17 +118,20 @@ void runMainApp(bool startService) async {
     gFFI.serverModel.startService();
   }
   runApp(App());
+  // restore the location of the main window before window hide or show
+  await restoreWindowPosition(WindowType.Main);
   // check the startup argument, if we successfully handle the argument, we keep the main window hidden.
   if (checkArguments()) {
     windowManager.hide();
   } else {
     windowManager.show();
     windowManager.focus();
+    // move registration of active main window here to prevent async visible check.
+    rustDeskWinManager.registerActiveWindow(kWindowMainId);
   }
   // set window option
   WindowOptions windowOptions = getHiddenTitleBarWindowOptions();
   windowManager.waitUntilReadyToShow(windowOptions, () async {
-    restoreWindowPosition(WindowType.Main);
     windowManager.setOpacity(1);
   });
 }
@@ -173,6 +176,11 @@ void runMultiWindow(
     widget,
     MyTheme.currentThemeMode(),
   );
+  // we do not hide titlebar on win7 because of the frame overflow.
+  if (Platform.isWindows &&
+      const [WindowsTarget.w7].contains(windowsBuildNumber.windowsVersion)) {
+    WindowController.fromWindowId(windowId!).showTitleBar(true);
+  }
   switch (appType) {
     case kAppTypeDesktopRemote:
       await restoreWindowPosition(WindowType.RemoteDesktop,
@@ -273,12 +281,18 @@ void runInstallPage() async {
 }
 
 WindowOptions getHiddenTitleBarWindowOptions({Size? size}) {
+  var defaultTitleBarStyle = TitleBarStyle.hidden;
+  // we do not hide titlebar on win7 because of the frame overflow.
+  if (Platform.isWindows &&
+      const [WindowsTarget.w7].contains(windowsBuildNumber.windowsVersion)) {
+    defaultTitleBarStyle = TitleBarStyle.normal;
+  }
   return WindowOptions(
     size: size,
     center: false,
     backgroundColor: Colors.transparent,
     skipTaskbar: false,
-    titleBarStyle: TitleBarStyle.hidden,
+    titleBarStyle: defaultTitleBarStyle,
   );
 }