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Commits:
Pass touch events 18a444c33074dd89f8855ad12dca1c55f566ff86 (stable, 1.4.2014, 5.3), 646cef5a8 (dev), 5a52faa8f (6.10), fb2db2c34 (6.9), 8db7017cb (tqtc/lts-6.8), 50e39db8c (tqtc/lts-6.5)

Run the Gesture examples from,

qt5/qtbase/examples/widgets/gestures/imagegestures

Try pinch, swipe and pan. They dont work.
Modify example to add tap and tapandhold gestures,

grabGesture(Qt::TapGesture);
grabGesture(Qt::TapAndHoldGesture);

Tap and TapAndHold gestures works.

Modify example to add, nativewindows attribute,

app.setAttribute(Qt::AA_NativeWindows);

Now 2 finger pan and 2 finger rotate works, and weirdly these gestures are treated as Pinch gestures.

relates to

QTBUG-73027 QWidgets never receive swipe gestures

QTBUG-30741 When using -no-native-gestures on Windows, the swipe gesture is not picked up

QTBUG-46195 [Windows]: Swipe gesture is not always recognized and sometimes in the wrong direction

QTBUG-14895 Qt Gestures - Pan and Swipe are not working

replaces

QTBUG-38925 Image gestures example does not work

For Gerrit Dashboard: QTBUG-37759
#	Subject	Branch	Project	Status	CR	V
663619,3	Wait for drag threshold before triggering pinch gesture	dev	qt/qtbase	Status: NEW	0	0
81883,2	WIP: Try to improve multiple gesture handling in image gestures example.	stable	qt/qtbase	Status: ABANDONED	0	0
84091,2	Polish the image gestures example.	4.8	qt/qt	Status: MERGED	+2	0
663620,4	ImageGestures example: decide direction based on swipeAngle	dev	qt/qtbase	Status: MERGED	+2	0
665120,2	ImageGestures example: decide direction based on swipeAngle	6.10	qt/qtbase	Status: MERGED	+2	0
665370,2	ImageGestures example: decide direction based on swipeAngle	6.9	qt/qtbase	Status: MERGED	+2	0
667368,2	ImageGestures example: decide direction based on swipeAngle	tqtc/lts-6.8	qt/tqtc-qtbase	Status: MERGED	+2	0
669461,2	ImageGestures example: decide direction based on swipeAngle	tqtc/lts-6.5	qt/tqtc-qtbase	Status: MERGED	+2	0