calling QQuickItem::update creates a hoverMoveEvent

Problem Description:
Calling QQuickItem::update (using a timer) creates a hoverMoveEvent for the item currently under the cursor.

Reproduction Steps:

• build and run the attached example
• check the "enable update timer" checkbox
• hover the mouse over the red rectangle

Observed Results:

• the red rectangle (HoverMove item) receives a hover move event (QQuickItem::hoverMoveEvent) every 250 ms (timer interval)

Expected Results:

• hover move events are only received when the mouse is actually moved