Fix for GL in OSX retina displays

modules/juce_opengl/opengl/juce_OpenGLContext.cpp

@@ -189,11 +189,13 @@ public:
     {
         if (ComponentPeer* peer = component.getPeer())
         {
-            Rectangle<int> newArea (peer->getAreaCoveredBy (component).withPosition (0, 0));
-
             const double newScale = Desktop::getInstance().getDisplays()
                                         .getDisplayContaining (component.getScreenBounds().getCentre()).scale;
 
+            Rectangle<int> newArea (peer->getComponent().getLocalArea (&component, component.getLocalBounds())
+                                                        .withPosition (0, 0)
+                                     * newScale);
+
             if (scale != newScale || viewportArea != newArea)
             {
                 scale = newScale;