RFR: 8364146: JList getScrollableUnitIncrement return 0

[Phil Race]

On Mon, 28 Jul 2025 09:14:48 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> It seems JList.getScrollableUnitIncrement can sometime return 0 instead of positive number which is not specified in the javadoc which can lead to confusion. Clarified javadoc as to when it can return 0.

Isn't this just a bug ?
I get zero from the test whenever "-1" is the direction - meaning scroll up - even if I use something like

https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/JList.html#getScrollableUnitIncrement(java.awt.Rectangle,int,int)

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PR Comment: https://git.openjdk.org/jdk/pull/26500#issuecomment-3145618302