StackPane has the following defects: 1. All measurement methods use raw insets rather than `snappedTopInset()`, `snappedLeftInset()`, etc. 2. `layoutChildren()` also uses raw insets and raw subtraction for the content rectangle. 3. Calculated totals and spans are not re-snapped after addition or subtraction.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - fix - tests Changes: https://git.openjdk.org/jfx/pull/2266/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2266&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8390673 Stats: 192 lines in 2 files changed: 157 ins; 5 del; 30 mod Patch: https://git.openjdk.org/jfx/pull/2266.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/2266/head:pull/2266 PR: https://git.openjdk.org/jfx/pull/2266
