MouseArea "released" signal triggered on positionChanged

This problem was seen with qt-qml at 0b6fd8966972616232054c5194243c52ca360bf8
and tesla HEAD at 330c5d987b16b4881fc4158bff6f05f95c48ff44

Right after the tesla demo has started, tap the green icon at the lower left corner of
the screen, then the right hand icon on the next screen, then click on a list item and drag.
Note how the drag trigger a "released" MouseArea signal that brings you to the next
screen, as if you had single-clicked the item.

See tesla/common/telephony/contacts/ContactsItem.qml line 103.
(this line will be changed to onClicked: ... , but still the drag should not trigger a released
signal.)