Fixes to allow OpenGL contexts to be attached to a top-level component.

modules/juce_gui_basics/components/juce_Component.cpp

@@ -1810,6 +1810,14 @@ void Component::internalRepaintUnchecked (const Rectangle<int>& area, const bool
 {
     if (flags.visibleFlag)
     {
+        if (cachedImage != nullptr)
+        {
+            if (isEntireComponent)
+                cachedImage->invalidateAll();
+            else
+                cachedImage->invalidate (area);
+        }
+
         if (flags.hasHeavyweightPeerFlag)
         {
             // if component methods are being called from threads other than the message
@@ -1823,14 +1831,6 @@ void Component::internalRepaintUnchecked (const Rectangle<int>& area, const bool
         }
         else
         {
-            if (cachedImage != nullptr)
-            {
-                if (isEntireComponent)
-                    cachedImage->invalidateAll();
-                else
-                    cachedImage->invalidate (area);
-            }
-
             if (parentComponent != nullptr)
                 parentComponent->internalRepaint (ComponentHelpers::convertToParentSpace (*this, area));
         }

modules/juce_opengl/native/juce_OpenGL_win32.h

@@ -113,6 +113,7 @@ public:
     unsigned int getFrameBufferID() const noexcept  { return 0; }
 
 private:
+    Component dummyComponent;
     ScopedPointer<ComponentPeer> nativeWindow;
     HGLRC renderContext;
     HDC dc;
@@ -137,7 +138,7 @@ private:
     void createNativeWindow (Component& component)
     {
         Component* topComp = component.getTopLevelComponent();
-        nativeWindow = createNonRepaintingEmbeddedWindowsPeer (&component, topComp->getWindowHandle());
+        nativeWindow = createNonRepaintingEmbeddedWindowsPeer (&dummyComponent, topComp->getWindowHandle());
         updateWindowPosition (topComp->getLocalArea (&component, component.getLocalBounds()));
         nativeWindow->setVisible (true);
         dc = GetDC ((HWND) nativeWindow->getNativeHandle());