fix windows hang-on

flutter_inappwebview_windows/lib/src/in_app_webview/custom_platform_view.dart

@@ -362,14 +362,14 @@ class _CustomPlatformViewState extends State<CustomPlatformView>
                       _reportSurfaceSize();
                       _reportWidgetPosition();
 
-                      if (!_focusNode.hasFocus) {
-                        _focusNode.requestFocus();
-                        Future.delayed(const Duration(milliseconds: 50), () {
-                          if (!_focusNode.hasFocus) {
-                            _focusNode.requestFocus();
-                          }
-                        });
-                      }
+                      // if (!_focusNode.hasFocus) {
+                      //   _focusNode.requestFocus();
+                      //   Future.delayed(const Duration(milliseconds: 50), () {
+                      //     if (!_focusNode.hasFocus) {
+                      //       _focusNode.requestFocus();
+                      //     }
+                      //   });
+                      // }
 
                       _pointerKind = ev.kind;
                       if (ev.kind == PointerDeviceKind.touch) {

flutter_inappwebview_windows/windows/custom_platform_view/graphics_context.cc

@@ -22,6 +22,20 @@ namespace flutter_inappwebview_plugin
     valid_ = true;
   }
 
+  GraphicsContext::~GraphicsContext()
+  {
+    // Explicitly release DirectX resources to prevent hanging process
+    if (device_context_) {
+      device_context_->ClearState();
+      device_context_->Flush();
+      device_context_ = nullptr;
+    }
+
+    device_winrt_ = nullptr;
+    device_ = nullptr;
+    valid_ = false;
+  }
+
   winrt::com_ptr<ABI::Windows::UI::Composition::ICompositor>
     GraphicsContext::CreateCompositor()
   {

flutter_inappwebview_windows/windows/custom_platform_view/graphics_context.h

@@ -12,6 +12,7 @@ namespace flutter_inappwebview_plugin
   class GraphicsContext {
   public:
     GraphicsContext(rx::RoHelper* rohelper);
+    ~GraphicsContext();
 
     inline bool IsValid() const { return valid_; }
 

flutter_inappwebview_windows/windows/in_app_webview/in_app_webview_manager.cpp

@@ -256,6 +256,26 @@ namespace flutter_inappwebview_plugin
     keepAliveWebViews.clear();
     windowWebViews.clear();
     UnregisterClass(windowClass_.lpszClassName, nullptr);
+
+    // Properly cleanup static DirectX resources to prevent hanging process
+    if (compositor_) {
+      // Release the extra reference we added in constructor
+      compositor_->Release();
+      compositor_ = nullptr;
+    }
+
+    // Reset graphics context to release DirectX resources
+    graphics_context_.reset();
+
+    // Cleanup dispatcher queue controller
+    if (dispatcher_queue_controller_) {
+      dispatcher_queue_controller_ = nullptr;
+    }
+
+    // Reset RoHelper
+    rohelper_.reset();
+
+    valid_ = false;
     plugin = nullptr;
   }
 }