RFR: 8346227: Seal Paint and Material

Fri Dec 13 23:37:50 UTC 2024

The `Paint` and `Material` classes can't be extended by user code, because their implementations require special support in internal JavaFX code. The classes should be sealed.

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Commit messages:
 - Seal Paint and Material

Changes: https://git.openjdk.org/jfx/pull/1665/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1665&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346227
  Stats: 4 lines in 3 files changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1665.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1665/head:pull/1665

PR: https://git.openjdk.org/jfx/pull/1665