Prevent default page action when starting a gesturemove

[andrewnicols]

This prevents some browsers from selecting the page text during a gesture.

[andrewnicols]

Unit test results from yeti:

nicols@lime:~/git/yui3/src$ yeti dd/tests/unit/index.html
  Agent connected: Chrome (31.0.1650.63) / Windows 8 from 121.45.249.164
  Agent connected: Chrome (31.0.1650.18) / iOS 7.0.4 from 121.45.249.164
  Agent connected: Firefox (26.0) / Mac OS from 121.45.249.164
  Agent connected: Chrome (31.0.1650.63) / Mac OS from 121.45.249.164
  Agent connected: Internet Explorer (10.0) / Windows 8 from 121.45.249.164
  Agent connected: Safari (7.0.1) / Mac OS from 121.45.249.164
  Agent connected: Safari (7.0) / iOS 7.1 from 121.45.249.164
  Agent connected: Firefox (26.0) / Windows 8 from 121.45.249.164
  Agent connected: Chrome (31.0.1650.59) / Linux from 149.254.180.245
  Agent connected: Chrome (31.0.1650.59) / Linux from 217.114.58.161
  Agent connected: Chrome (34.0.1784.0) / Mac OS from 121.45.249.164
  Agent connected: Safari (6.1) / Mac OS from 83.100.191.135
✓ Testing started on Chrome (31.0.1650.63) / Windows 8, Chrome (31.0.1650.18) / iOS 7.0.4, Firefox (26.0) / Mac OS, Chrome (31.0.1650.63) / Mac OS, Internet Explorer (10.0) / Windows 8, Safari (7.0.1) / Mac OS, Safari (7.0) / iOS 7.1, Firefox (26.0) / Windows 8, Chrome (31.0.1650.59) / Linux, Chrome (31.0.1650.59) / Linux, Chrome (34.0.1784.0) / Mac OS, Safari (6.1) / Mac OS
► Testing... - 0% complete (0/12) 35.27 beats/sec   Agent disconnected: Safari (6.1) / Mac OS from 83.100.191.135
✗ Error: undefined
  User-Agent: Safari (6.1) / Mac OS
✓ Agent completed: Safari (6.1) / Mac OS
✓ Agent completed: Safari (7.0.1) / Mac OS
✓ Agent completed: Safari (7.0) / iOS 7.1
✓ Agent completed: Chrome (31.0.1650.18) / iOS 7.0.4
✓ Agent completed: Chrome (34.0.1784.0) / Mac OS
✓ Agent completed: Chrome (31.0.1650.63) / Mac OS
✓ Agent completed: Firefox (26.0) / Mac OS
✓ Agent completed: Chrome (31.0.1650.63) / Windows 8
✓ Agent completed: Firefox (26.0) / Windows 8
✓ Agent completed: Internet Explorer (10.0) / Windows 8
► Testing... - 75% complete (9/12) 29.02 beats/sec ETA 15 seconds   Agent connected: Chrome (30.0.1599.114) / Linux from 217.114.58.37
✗ Script error: Uncaught TypeError: Cannot read property 'Console' of undefined
  URL: src/dd/tests/unit/index.html
  Line: 43
  User-Agent: Chrome (31.0.1650.59) / Linux
  Agent disconnected: Chrome (31.0.1650.59) / Linux from 217.114.58.161
✗ Error: undefined
  User-Agent: Chrome (31.0.1650.59) / Linux
✓ Agent completed: Chrome (31.0.1650.59) / Linux

✗ Error: Agent timed out running test: /agent/1389710674508250944/batch/1389711101592418898/test/src/dd/tests/unit/index.html
  User-Agent: Chrome (31.0.1650.59) / Linux
✓ Agent completed: Chrome (31.0.1650.59) / Linux
✓ 423 tests passed! (5 minutes, 1 second)

I'm fairly sure that the warnings relate to browsers dropping off during testing. I live in Australia and some of the kind victims doing my testing are located half way across the world. Latency is a little high and yeti does not cope well with it.

[clarle]

This looks good and is the same suggestion that @rgrove proposed in #693.

👍, and will merge this in after 72 hours or reviewer 👍.

[andrewnicols]

Are we good to pull this now @clarle?

Cheers,

Andrew

[clarle]

Merged into dev-master and dev-3.x.

Thanks again for the contribution, @andrewnicols!

[sgilligan]

I'm seeing a side effect of this where the momentum scrolling on ios no longer works. Please see #1716.