Windows: Fixed a focus ping-pong issue in the native file chooser when using a custom component

modules/juce_gui_basics/native/juce_win32_FileChooser.cpp

@@ -120,6 +120,8 @@ public:
             EndDialog (hwnd, 0);
     }
 
+    Component* getCustomComponent()    { return customComponent.get(); }
+
     Array<URL> results;
 
 private:
@@ -567,6 +569,9 @@ public:
         if (targetComponent == nullptr)
             return false;
 
+        if (targetComponent == nativeFileChooser->getCustomComponent())
+            return true;
+
         return targetComponent->findParentComponentOfClass<FilePreviewComponent>() != nullptr;
     }