RFR: 8252935: Add treeShowing listener only when needed [v4]

[Jeanette Winzenburg]

On Wed, 10 Feb 2021 14:29:09 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> somehow missed that the red cross on the checks below might be related to test failures (vs. pre-checking compile issues or such only ;) Any way to see the failing tests only? Scrolling through the complete log is a bit .. well
>
> Sadly, there is no way to view just the failures -- at least not right now. What I do is open the raw log and look for "FAILED" (all caps).
> 
> I'll file an RFE to see whether we can produce a summary of the test failures, but I won't have time to look at it right away.

thanks for the info :)

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PR: https://git.openjdk.java.net/jfx/pull/185