UIViewComponentPeer: Fix stalled rendering when JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS is enabled

modules/juce_gui_basics/native/juce_UIViewComponentPeer_ios.mm

@@ -2211,7 +2211,10 @@ void UIViewComponentPeer::displayLinkCallback()
     for (const auto& r : deferredRepaints)
         [view setNeedsDisplayInRect: convertToCGRect (r)];
 
-    deferredRepaints.clear();
+   #if JUCE_COREGRAPHICS_RENDER_WITH_MULTIPLE_PAINT_CALLS
+    if (metalRenderer == nullptr)
+   #endif
+        deferredRepaints.clear();
 }
 
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