<Swing Dev> RFR: 8058704: Nimbus does not honor JTextPane background color [v2]

[Prasanta Sadhukhan]

On Wed, 4 Aug 2021 23:06:35 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

>> It looks the fix doesn't work or alternatively it works in an unexpected way.
>> 
>> Both JEditorPane and JTextPane used to have white background but now, with these changes, their background is the same of the panel below. It's probably know what we want.
>
> The last time this code was touched we get a regression https://bugs.openjdk.java.net/browse/JDK-8266510 which was not found by any tests. JCK cannot found them since this is L&F dependent. And regression tests do not have related tests because we had never bugs here, it worked this way from the beginning.
> 
> So it will be good to understand why these tags prevent the color change, how the shape tags are used, instead of some unknown changes here and there.

JDK-8266510 regression was found by SwingSet2 so it is wrong to say it was not found by any test, maybe it was not verified during fix of JDK-8249674. For this, all existing test is run.

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PR: https://git.openjdk.java.net/jdk/pull/4930