Updated Metal Border code for JInternalFrame. - Added instanceof check before casting Graphics to G2D. - Replaced roundHalfDown with Region.clipRound()
------------- Commit messages: - removed unused import - JIF MetalBorder update Changes: https://git.openjdk.org/jdk/pull/11305/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11305&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8297449 Stats: 112 lines in 1 file changed: 10 ins; 19 del; 83 mod Patch: https://git.openjdk.org/jdk/pull/11305.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11305/head:pull/11305 PR: https://git.openjdk.org/jdk/pull/11305
