Poor quality of vector images

[goosesima]

Expected Behavior

Good anti-aliasing

Actual Behavior

Incorrect anti-aliasing

Steps to Reproduce

1.Open Scratch 3.0
2.Click on full screen

Operating System and Browser

Windows 10, Chrome v.68.0.3440.106

[thisandagain]

Moved to scratchfoundation/scratch-render#334