RFR: 8323511 Scrollbar Click jumps inconsistent amount of pixels

[Kevin Rushforth]

On Wed, 10 Jan 2024 12:31:20 GMT, Florian Kirmaier <fkirmaier at openjdk.org> wrote:

> As seen in the unit test of the PR, when we click on the area above/below the scrollbar the position jumps - but the jump is now not always consistent.
> In the current version on the last cell - the UI always jumps to the top. In the other cases, the assumed default cell height is used.
> 
> With this PR, always the default cell height is used, to determine how much is scrolled.
> This makes the behavior more consistent.
> 
> Especially from the unit-test, it's clear that with this PR the behavior is much more consistent.
> 
> This is also related to the following PR: https://github.com/openjdk/jfx/pull/1194

Reviewers: @johanvos @andy-goryachev-oracle

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PR Comment: https://git.openjdk.org/jfx/pull/1326#issuecomment-1884771651