Swipe and pan gestures

This is a follow-up of https://bugreports.qt-project.org/browse/QTBUG-37885

As stated in the comments of this bug, swipe gestures are never triggered on 5.2.1. In fact I was unable to see one swipe gesture whatever the version or platform from qt4.x up to 5.3.0-beta1.

In 5.2.1 the only (rare) messages I am able to get in the console on Android are:

D/GestureDetector(11367): [Surface touch Event] Palm swipe start, x:260.66666 m:405.0 s:51.0 TILT_TO_ZOOM_XVAR: 154.28572

D/GestureDetector(11367): [Surface Touch Event] Palm Swipe Fail 2 - max s:72.0 s1:4 s2:60 s3:0 s4:0 dist:288.33334 mVarXBig:false validMajorCount:2

Pan gestures are generated from time to time but seems to require 2 fingers, which is quite odd to me.

The example provided in QTBUG-37885 is with a QGraphicsWidget, but even a simple QLabel do not generate any swipe gesture. I can provide an example with a QLabel if needed.

Thanks
Philippe LELONG