Investigate symbol-visibility/visible render test difference

[ChrisLoer]

There is a small difference causing this test to fail:

The icon that disappears in the native version is right on the edge of a collision, so this could be the result of some very small difference in precision/rounding between platforms. Ideally, JS and native should be perfectly in sync for collisions.

/cc @ansis @jfirebaugh

[stale]

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