RegionBackgroundImageUITest.unalignedImage_Cover fails only on Mac with following error.
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test.robot.javafx.scene.layout.RegionBackgroundImageUITest > unalignedImage_Cover FAILED
    java.lang.AssertionError: expected:rgba(0,255,0,255) but was:rgba(0,201,54,255) at position x=134, y=134
        at test.robot.javafx.scene.layout.RegionUITestBase.assertColorEquals(RegionUITestBase.java:114)
        at test.robot.javafx.scene.layout.RegionBackgroundImageUITest.checkNonRepeating(RegionBackgroundImageUITest.java:1026)
        at test.robot.javafx.scene.layout.RegionBackgroundImageUITest.unalignedImage_Cover(RegionBackgroundImageUITest.java:677)
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Test failed even before JDK-8088739 was fixed.