[jdk21u-dev] RFR: 8187759: Background not refreshed when painting over a transparent JFrame

[Goetz Lindenmaier]

On Thu, 11 Apr 2024 03:24:45 GMT, Amos Shi <ashi at openjdk.org> wrote:

> Backport of [JDK-8187759](https://bugs.openjdk.org/browse/JDK-8187759)
> 
> Testing
> - Local: Not tested - the test `JFrameBackgroundRefreshTest.java` needs `os.family == "linux"`, while the local is MacOS
> - Pipeline: **All checks have passed**
> - Testing Machine: SAP nightlies passed on `2024-04-16,19,20`

I ran the test.
It reproduces the issue and passes with the fix.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/487#issuecomment-2068042470