RFR: 8336389: Infinite loop occurs while resolving lookups [v7]

[Kevin Rushforth]

On Fri, 2 Aug 2024 15:02:13 GMT, John Hendrikx <jhendrikx at openjdk.org> wrote:

>> Fixes an infinite loop that can occur while resolving lookups.
>> 
>> There were 2 bugs:
>> - A `contains` check was done on some value X, but then a value Y was added to the set used to track duplicates
>> - The `Set` to track duplicates was cleared in some recursive calls, meaning that the caller (which may be processing multiple values in a loop) would end up with an empty set, losing track of what was visited so far
>> 
>> Also removed a redundant `null` check (an NPE would have occurred before it could reach that code).
>
> John Hendrikx has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update CssStyleHelper.java

Marked as reviewed by kcr (Lead).

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PR Review: https://git.openjdk.org/jfx/pull/1505#pullrequestreview-2215916092