Dev test: Graphing Lines 1.2.0-dev.2

[pixelzoom]

Previous dev test (1.2.0-dev.1) is #816. See that issue for pointers to query parameters, terminology, etc.

Dev test:
http://www.colorado.edu/physics/phet/dev/html/graphing-lines/1.2.0-dev.2/graphing-lines_en.html

iFrame test:
http://www.colorado.edu/physics/phet/dev/html/graphing-lines/1.2.0-dev.2/graphing-lines_en-iframe.html

GitHub issues to regression tests:

• Assertion failure, two different points are required graphing-lines#75
• pick up the fix for web audio for 1.2 release graphing-lines#76
• in iFrame line games pointers can be dragged off screen to the right and are not recoverable graphing-slope-intercept#16

In addition to the specific issues above, the fix for phetsims/graphing-lines#78 (memory leak) touched a lot of code. It's not necessary to re-verify the memory test. But please give the entire sim a close look on at least 1 platform to make sure there was no collateral damage.

Please mention this issue in any GitHub issues that you create.

Assigned to @phet-steele, please work out prioritization with @ariel-phet.

[phet-steele]

@pixelzoom this is completed. Sim is very solid at this point.

[pixelzoom]

Thanks @phet-steele and team.

[pixelzoom]

Since this dev test went well (no issues), I was planning to use the 1.2.0-dev.2 shas for 1.2.0-rc.1. But then I discovered that @jessegreenberg published 1.2.0-dev.3, and I have no idea if it addresses anything relevant to this sim. So RC testing is blocked until I can find out what's up with 1.2.0-dev.3.

[pixelzoom]

According to @jessegreenberg, Graphing Lines 1.2.0-dev.3 was used to test phetsims/joist#140 (a11y heartbeat fix), not relevant to production sims yet. So I can proceed with the shas from 1.2.0-dev.2.

[pixelzoom]

RC test task #843 created. Closing.