RFR: 8281296: Create a regression test for JDK-4515999

[Alexey Ivanov]

On Mon, 7 Feb 2022 08:18:23 GMT, Manukumar V S <mvs at openjdk.org> wrote:

> Create a regression test for [JDK-4515999](https://bugs.openjdk.java.net/browse/JDK-4515999)
> Create a test which checks whether incrementing dates via the keyboard (up/down) gives the same results as when using mouse press on the arrow buttons in a JSpinner.

test/jdk/javax/swing/JSpinner/4515999/JSpinnerMouseAndKeyPressTest.java line 89:

> 87:                         (spinnerButtonWidth / 2);
> 88:                 spinnerUpButtonCenter.y = spinnerLocationOnScreen.y +
> 89:                         spinnerQuarterHeight;

The [Java Style Guidelines](http://cr.openjdk.java.net/~alundblad/styleguide/index-v6.html#toc-wrapping-lines) suggests breaking before the operators.

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PR: https://git.openjdk.java.net/jdk/pull/7363