Workaround for some OSX10.11 repaint region coalescing problems

modules/juce_graphics/geometry/juce_RectangleList.h

@@ -524,7 +524,7 @@ public:
     */
     void consolidate()
     {
-        for (int i = 0; i < getNumRectangles() - 1; ++i)
+        for (int i = 0; i < rects.size() - 1; ++i)
         {
             RectangleType& r = rects.getReference (i);
             const ValueType rx1 = r.getX();

modules/juce_gui_basics/native/juce_mac_NSViewComponentPeer.mm

@@ -859,18 +859,14 @@ public:
 
     void repaint (const Rectangle<int>& area) override
     {
-        Rectangle<float> r ((float) area.getX(), [view frame].size.height - (float) area.getBottom(),
-                            (float) area.getWidth(), (float) area.getHeight());
-
-        if (insideDrawRect || areAnyWindowsInLiveResize())
-        {
-            deferredRepaints.add (r);
-            triggerAsyncUpdate();
-        }
-        else
-        {
-            [view setNeedsDisplayInRect: makeNSRect (r)];
-        }
+        // In 10.11 changes were made to the way the OS handles repaint regions, and it seems that it can
+        // no longer be trusted to coalesce all the regions, or to even remember them all without losing
+        // a few when there's a lot of activity.
+        // As a work around for this, we use a RectangleList to do our own coalescing of regions before
+        // asynchronously asking the OS to repaint them.
+        deferredRepaints.add ((float) area.getX(), (float) ([view frame].size.height - area.getBottom()),
+                              (float) area.getWidth(), (float) area.getHeight());
+        triggerAsyncUpdate();
     }
 
     void invokePaint (LowLevelGraphicsContext& context)