failing jalview.gui.AlignmentPanelTest.setScrollValues when local user prefs deleted

Looks like there is a test that only works on OSX if there is an already populated .jalview_properties available. I removed mine for JAL-4635 and noticed an additional unexpected fail:

Gradle suite > Gradle test > jalview.gui.AlignmentPanelTest.testSetScrollValues FAILED
    java.lang.AssertionError: expected [121] but found [66]
        at org.testng.Assert.fail(Assert.java:94)
        at org.testng.Assert.failNotEquals(Assert.java:496)
        at org.testng.Assert.assertEquals(Assert.java:125)
        at org.testng.Assert.assertEquals(Assert.java:372)
        at org.testng.Assert.assertEquals(Assert.java:382)
        at jalview.gui.AlignmentPanelTest.testSetScrollValues(AlignmentPanelTest.java:122)