Pixelated Popup borders (Material Style)

When you show a QQC2 Material-style Popup with an even value in width or height properties, it gets pixelated (not sure if that's the correct word). An screen-shot image is attached to show it. An example is also provided with a Dialog which width and height properties are binded to the width and height of the parent Window, respectively, so you can resize the window and see that the borders become pixelated. This is a problem with dialogs that contains some controls, so another example of a BusyIndicator running inside a Dialog (which is a very common usage) is also provided, with the respective screen-shot.

Both examples can be executed with qmlscene (pass the --style=material flag).