scrollable ember-collection

On Mac Safari, with System Preferences set to "Scroll Always",
a vertically oriented ember-collection with content larger than its container does not show a visible scroll bar.
This is not a problem in other browsers such as Chrome.
We discovered that the presence of matrix3d() in the style generated inside the ember-collection seems to be responsible. Forcing matrix3d() to be replaced with matrix() seems to solve the issue.

Start by reproducing the issue in Mac Safari with System Preferences set to Scroll Always using a vertically oriented ember-collection whose content overflows its container. Inspect where ember-collection generates inline styles containing matrix3d(); the reported done state is that the visible scrollbar appears in Safari without breaking other browsers.

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