Strange Multitouch Behavior

[KatieWoe]

Test device:
Dell Laptop
Operating System:
Windows 10
Browser:
Chrome 67.0.3396.99
Problem description:
The skater will randomly teleport, gain energy, and fly off in random directions if held aloft while switching tracks in the intro and friction screens. This is done using multitouch.
For phetsims/qa/issues/134
Steps to reproduce:

1. Go to the intro screen.
2. Drag the skater to an empty part of the screen and Fire on Hold
3. While holding the skater, select one of the other track scene buttons using multitouch.
4. To see effect on energy, select the Bar Graph checkbox

Screenshots:
Since you can't see what my hands are doing. My left hand is holding the skater in one place, not moving. My right is selecting different scene buttons or activating the bar graph.

Troubleshooting information (do not edit):

Name: ‪Energy Skate Park: Basics‬ URL: https://phet-dev.colorado.edu/html/energy-skate-park-basics/1.4.0-dev.1/phet/energy-skate-park-basics_en_phet.html Version: 1.4.0-dev.1 2018-06-20 00:09:06 UTC Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36 Language: en-US Window: 1536x741 Pixel Ratio: 2.5/1 WebGL: WebGL 1.0 (OpenGL ES 2.0 Chromium) GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium) Vendor: WebKit (WebKit WebGL) Vertex: attribs: 16 varying: 30 uniform: 4096 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32) Max viewport: 16384x16384 OES_texture_float: true Dependencies JSON: {"assert":{"sha":"928741cf","branch":"master"},"axon":{"sha":"f0522e7c","branch":"master"},"brand":{"sha":"89d28f63","branch":"master"},"chipper":{"sha":"e8946524","branch":"master"},"dot":{"sha":"6482f8c9","branch":"master"},"energy-skate-park-basics":{"sha":"288fcefd","branch":"master"},"joist":{"sha":"22e437d5","branch":"master"},"kite":{"sha":"a1086efc","branch":"master"},"phet-core":{"sha":"17326041","branch":"master"},"phet-io":{"sha":"3ea0727a","branch":"master"},"phet-io-wrapper-classroom-activity":{"sha":"53708616","branch":"master"},"phet-io-wrapper-hookes-law-energy":{"sha":"8a546a32","branch":"master"},"phet-io-wrapper-lab-book":{"sha":"1527afd6","branch":"master"},"phet-io-wrappers":{"sha":"8d814eab","branch":"master"},"phetcommon":{"sha":"6ec8cd89","branch":"master"},"query-string-machine":{"sha":"4182612f","branch":"master"},"scenery":{"sha":"88cb642e","branch":"master"},"scenery-phet":{"sha":"7bcde0b2","branch":"master"},"sherpa":{"sha":"88c3b828","branch":"master"},"sun":{"sha":"7579e8fa","branch":"master"},"tandem":{"sha":"8461b6f3","branch":"master"}}

[KatieWoe]

Issue is also present on iOS 9.3.5 on the iPad Air 2.

[jessegreenberg]

Thanks @KatieWoe, reproduced.

[jessegreenberg]

I was able to reproduce the issue in the published sim, just checked to see if it was related to #371

[jessegreenberg]

When switching scenes, the skater is supposed to reset but maybe the drag handler is not interrupted.

[jessegreenberg]

I am seeing similar issues after pressing the ResetAllButton.

[jessegreenberg]

Fixed in the above commit. Closing.