Moving an element in the model breaks the positioning of delegates in a ListView

When moving an element to the top of the model, the y positions of all the delegates in the ListView are incremented by the value of the 'spacing' property.

The file attached is a minimal example that demonstrates the issue: every 1000 milliseconds, the timer moves the element at index 1 to index 0, and as a consequence the y coordinate of all the delegates is incremented by 10 (the value of the 'spacing).

Note that the mirror operation (moving the element at index 0 to index 1) doesn't expose the issue.