Raised tracks now cover graph

[KatieWoe]

Test device
Dell
Operating System
Win 10
Browser
Chrome
Problem description
For phetsims/qa#470. Related to #115, which involves extending the fixed track on the graphs screen by continually manipulating the three point track under the ground to push it up. This was decided to not be fixed. However, the tracks now layer on top of, instead of beneath, the graph. This looks much more odd and could pose more of a problem.
Steps to reproduce
Same as #115

Visuals

Troubleshooting information:

!!!!! DO NOT EDIT !!!!!
Name: ‪Energy Skate Park‬
URL: https://phet-dev.colorado.edu/html/energy-skate-park/1.0.0-dev.6/phet/energy-skate-park_en_phet.html
Version: 1.0.0-dev.6 2020-01-27 21:28:50 UTC
Features missing: touch
Flags: pixelRatioScaling
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36
Language: en-US
Window: 1536x722
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: 32767x32767
OES_texture_float: true
Dependencies JSON: {}

[jessegreenberg]

Thanks @KatieWoe, ill take a look.

[KatieWoe]

Interestingly it does stop going up at a certain point:

[jessegreenberg]

Thanks for verifying! We did decide to fix this, it is just that the limiting bounds are too large for the graphs screen. Can you please check to see if this is fixed in master?

[KatieWoe]

Looks fixed in master

[jessegreenberg]

Great, thanks for checking.