iOS requires that the view have a background #1730
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If there is no color set, then iOS can't clear it. As a result, the canvas is clear, but then it draws that clear canvas onto whatever there was before.
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Description of Change
If there is no color set, then iOS can't clear it. As a result, the canvas is clear, but then it draws that clear canvas onto whatever there was before. And what was there before was the canvas so it keeps stacking things up.
This PR make sure that we let iOS know that it has to clear the underlying surface with transparent.
Bugs Fixed
An issue where the canvas never really cleared.
API Changes
None.
Behavioral Changes
None.
PR Checklist