mouse grab not being cleared on TouchCancel

Steps to reproduce the issue:
1 - Have a qml application comprised of just a MouseArea
2 - Do a touch drag along its window which gets canceled before it gets released

Expected outcome:

• MouseArea emits released(). pressed changed to false.

Actual outcome:

• MouseArea gets stuck on pressed state forever.

Comments:
Already got a fix for it. Just missing a test before I can propose it.