RFR: JDK-8277396: [TESTBUG] In DefaultButtonModelCrashTest.java, frame is accessed from main thread

[Prasanta Sadhukhan]

On Thu, 18 Nov 2021 13:17:16 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

> It's a little cleanup: make sure `frame` is accessed from EDT only, remove unused variables and imports.

I guess there's  probably 100+ tests in swing that access frame outside EDT before it calls dispose ex. 
Action/8133039/bug8133039.java, Box/TestBoxFiller.java, ButtonGroup/TestButtonGroupFocusTraversal.java, JButton/4368790/bug4368790.java, JButton/4796987/bug4796987.java..

If you are changing this, then those also needs to be updated, I guess..

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PR: https://git.openjdk.java.net/jdk/pull/6455