Reverted Qt patch and then we need to clamp maxHeight to 1440 pixels.

We take devicePixelRatio into consideration here so that screens with
DPR==1 don't get upscaled from 720 pixels (which doesn't look good).

Related to #10

src/main.cpp

@@ -242,7 +242,7 @@ int main(int argc, char *argv[])
     // we can use the GPU to transfer tiles directly.
     // See more discussion in: https://github.com/plexinc/plex-media-player/issues/10
 #ifdef Q_OS_MAC
-    engine->rootContext()->setContextProperty("webMaxHeight", 1080);
+    engine->rootContext()->setContextProperty("webMaxHeight", 720);
 #else
     engine->rootContext()->setContextProperty("webMaxHeight", 0.0);
 #endif

src/ui/webview.qml

@@ -45,8 +45,8 @@ KonvergoWindow
     transformOrigin: Item.TopLeft
     scale:
     {
-      var verticalScale = height / 720;
-      var horizontalScale = width / 1280;
+      var verticalScale = ((height * 2) / Screen.devicePixelRatio) / 720;
+      var horizontalScale = ((width * 2) / Screen.devicePixelRatio) / 1280;
 
       var desiredScale = Math.min(verticalScale, horizontalScale);
       var maximumScale = webMaxHeight ? (webMaxHeight / 720) : 10;