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.
------------- Commit messages: - 8364146: JList getScrollableUnitIncrement return 0 Changes: https://git.openjdk.org/jdk/pull/26500/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26500&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8364146 Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/26500.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/26500/head:pull/26500 PR: https://git.openjdk.org/jdk/pull/26500
