RFR: JDK-8290016: IGV: Fix graph panning when mouse dragged outside of window [v2]

[Tobias Holenstein]

On Tue, 12 Jul 2022 16:24:05 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Tobias Holenstein has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixed locking in CustomizablePanAction
>
> Good.

thanks @vnkozlov and @TobiHartmann for the reviews!

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PR: https://git.openjdk.org/jdk/pull/9470