GlyphView.paint() draws background bounding the passed Shape, while the span reserved for the superscripted text is taller than the height of the glyphs so it is better to use the painter.getHeight() instead of alloc.height to fill the actual glyphs boundary
Before fix <img width="103" height="93" alt="image" src="https://github.com/user-attachments/assets/e673d214-13c7-4a42-8f55-cfd654e5a978"; /> With fix <img width="110" height="86" alt="image" src="https://github.com/user-attachments/assets/c13377a6-b4ac-406c-a153-a55c0b9a917b"; /> No regressions is observed in CI..A manual verification test is provided.. ------------- Commit messages: - 8017266: Background is painted taller than needed for styled text. Changes: https://git.openjdk.org/jdk/pull/27947/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27947&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8017266 Stats: 81 lines in 2 files changed: 79 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/27947.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/27947/head:pull/27947 PR: https://git.openjdk.org/jdk/pull/27947
