<Swing Dev> RFR: 8252825: Add automated test for fix done in JDK-8218479

[Phil Race]

On Sun, 6 Sep 2020 15:21:45 GMT, Pankaj Bansal <pbansal at openjdk.org> wrote:

> Under JDK-8218479, fix was made to correct the rendering of JTextPane as the background color of JTextPane was similar
> to Panel color, so it looked like the JTextPane has transparent background. No automated test was written to verify the
> results. Current bug is to write the automated tests for the same.  The test fails without the fix done in JDK-8218479
> and pass with the fix. I have run the tests multiple times in mach5. Links in JBS.

Marked as reviewed by prr (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/30