Image: center aligned & PreserveAspectFit can result in small misalignment of painted img

If a Qml Image has its fill mode set to Image.PreserveAspectFit and its vertical and horizontal alignment are both centered the painted image occasionally appears to be misaligned by a small amount.

Steps to reproduce the issue:

1. Run the attached project
2. Observe the alignment of the painted image

Note: the misalignment is only 1px in the example.