After the size of `ScrollPane` child component changes, it recalculates the size of the scroll bars and hides or shows them as necessary. This situation is handled in `WScrollPanePeer.childResized`:
https://github.com/openjdk/jdk/blob/ee4ab6709ebaf8a1b1e9f297a7c53205987f3eba/src/java.desktop/windows/classes/sun/awt/windows/WScrollPanePeer.java#L104-L109 After [JDK-8297923](https://bugs.openjdk.org/browse/JDK-8297923), `setSpans` is run asynchronously on the toolkit thread. Thus, `setInsets` calculates the incorrect values because `setSpans` hasn't updated the sizes yet. This is a regression from [JDK-8297923](https://bugs.openjdk.org/browse/JDK-8297923). **Fix** The insets are updated in the native implementation of `setSpans` directly. The native implmenation of `setInsets` method is run on the toolkit thread as a synchronous call because the insets are used in [`WScrollPanePeer.initialize`](https://github.com/openjdk/jdk/blob/ee4ab6709ebaf8a1b1e9f297a7c53205987f3eba/src/java.desktop/windows/classes/sun/awt/windows/WScrollPanePeer.java#L62-L67). ------------- Commit messages: - 8297923: Add the bugid to the test - 8310054: ScrollPane insets are incorrect Changes: https://git.openjdk.org/jdk/pull/14478/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14478&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8310054 Stats: 13 lines in 3 files changed: 7 ins; 1 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/14478.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14478/head:pull/14478 PR: https://git.openjdk.org/jdk/pull/14478
