[Rev 03] RFR: 8236912: NullPointerException when clicking in WebView with Button 4 or Button 5

[Guru Hb]

On Fri, 24 Jan 2020 14:41:11 GMT, Robert Lichtenberger <rlichten at openjdk.org> wrote:

>> As documented in JDK-8236912, WebView did not check whether the idMap really contained a mapping for the given button, making it prone to errors, when things are extended (as has happened here).
>> 
>> The fix consists of two test cases that show the problem in unfixed WebViews and a fix which works analogously to the check whether the given event type is mapped.
> 
> Previous commits in this pull request have been removed, probably due to a force push. The incremental views will show differences compared to the previous content of the PR.

Marked as reviewed by ghb (Reviewer).

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PR: https://git.openjdk.java.net/jfx/pull/85