RFR: 8277853: With Touch enabled devices scrollbar disappears and the table is scrolled to the beginning

[Kevin Rushforth]

On Thu, 2 Dec 2021 10:12:50 GMT, meghanEmbrace <duke at openjdk.java.net> wrote:

> With a touch-enabled device, the scrollbar disappears a short while after it's used. During the layout, updateHbar() checks the hbar visibility and resets the clip, causing the user to be scrolled fully to the left when trying to access columns on the right. Using hbar.isVisible() is not feasible as there are times when the scrollbar is necessary but not visible (such as on touch-enabled devices where the scrollbar disappears when not in use, or when hidden by CSS). Hence, it is more reliable to use the variable that determines whether the hbar is necessary.

This seems like the correct fix, but I'll ask @aghaisas to review. What testing have you done to ensure that there are no regressions or unintended side effects of this change? Can you provide an automated test?

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PR: https://git.openjdk.java.net/jfx/pull/688