PinchArea with Flickable child doesn't work when using MainView

[Ugo Riboni]

When using a PinchArea which contains a Flickable in an application that uses MainView, the PinchArea doesn't work and always reports pinch.scale 1.0 when doing pinch gestures.

If I remove the MainView and use only an Item as the root item, the pinch gesture works again.

[Ugo Riboni (uriboni)]

Simple QML example that reproduces the problem.

Steps to reproduce:
- launch the app
- do a pinch gesture
- look at the console output. you see the pinch reporting 1 all the time

[Ugo Riboni (uriboni)]

This was tested on a nexus 4 device with qtdeclarative5-ubuntu-ui-toolkit-plugin: 1.1.1181+14.10.20140806-0ubuntu1

Another strange behaviour I'm seeing is the following:
- do a pinch gesture with 2 fingers: the output reports pinch.scale = 1
- while still leaving the 2 fingers on the glass, put down a third finger and do a pinch gesture with it: the output reports pinch.scale changing

[PS Jenkins bot (ps-jenkins)]

Fix committed into lp:ubuntu-ui-toolkit/staging at revision None, scheduled for release in ubuntu-ui-toolkit, milestone Unknown