RFR: 6911375: mouseWheel has no effect without vertical scrollbar [v3]

[Alexey Ivanov]

On Wed, 2 Mar 2022 13:17:28 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

>> It is observed that mouseWheel doesn't scroll through a list if there is no scrollbar even though pressing PageUp/Down using keyboard moves up/down the list.
>> Issue stems from the fact that BasicScrollPaneUI.Handler.mouseWheelMoved() skips the mouse wheel events when the scrollbar is not visible. 
>> Fixed to handle mouseWheelEvent even though scrollbar is not visible with the assumption that if both vertical and horizontal scrollbar is not visible, then assume default orientation to be vertical.
>> 
>> Existing jtreg, jck tests are ok. All L&F works well with the fix and testcase works in all platforms except on mac which will be handled separately.
>
> Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add volatile keyword in test

Marked as reviewed by aivanov (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7585