RFR: 8257455: javax/swing/Security/6378709/TimerHack.java and javax/swing/JFileChooser/4163841/AcceptAllFileFilterTest.java fails in CI

[Tejesh R]

On Tue, 14 Mar 2023 10:06:47 GMT, Tejesh R <tr at openjdk.org> wrote:

> The issue is intermittent and was not able to reproduce it. Though through code analysis and bug reported logs, the issue seems to be in COM thread of `FilesLoader` class in `BasicDirectoryModel` file. Looks like there are certain places where the `filecache` variable isn't thread-safe, and this fix address the issue. 
> Mach5 test runs are fine, no regressions were found.

Since this include test from closed, I will close this PR and the Bug, will raise an Bug without mentioning the closed test so that it can be taken care as open.

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PR Comment: https://git.openjdk.org/jdk/pull/13012#issuecomment-1500797905