<Swing Dev> RFR: 8252194: Add automated test for fix done in JDK-8218469

[Jayathirth D V]

On Sun, 27 Sep 2020 16:44:12 GMT, Pankaj Bansal <pbansal at openjdk.org> wrote:

> Under JDK-8218469, fix was made to correct the rendering of JSlider as the Slider knob/head was not being rendered at
> all. The reason was that gtk3 changed the way styles are used. No automated test was written to verify the results.
> Current bug is to write the automated tests for the same. I have verified that the test fails without the fix done for
> DK-8218469 and passes with the fix.

Marked as reviewed by jdv (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/374