We have code which triggers repaints for "default buttons" in dialogs, and for progress bars which aren't indeterminate. That's because on 10.9 and below, the native appearance for those widgets was animated: default buttons had a blue pulse, and progress bars had a blue flow animation. Now that we no longer support 10.9, we can stop triggering these repaints.
Bug 1665991 Comment 0 Edit History
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We have code which triggers repaints for "default buttons" in dialogs, and for progress bars which aren't indeterminate. That's because on 10.9 and below, the native appearance for those widgets was animated: default buttons had a blue pulse, and progress bars had a blue flow animation. Now that we no longer support 10.9, we can stop triggering these repaints. [Indeterminate progress bars](https://jsbin.com/hukaqat/edit?html,output) still animate.