This PR fixes the regression introduced with [JDK-8087673](https://bugs.openjdk.org/browse/JDK-8087673) by only modifying the header's width if it is the last visible column.
Two tests that fail before the proposed patch and pass after it have been also included. ------------- Commit messages: - update license header - Only modify header's width if it is the last visible column, and include tests Changes: https://git.openjdk.org/jfx/pull/1166/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1166&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8311127 Stats: 101 lines in 3 files changed: 99 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jfx/pull/1166.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1166/head:pull/1166 PR: https://git.openjdk.org/jfx/pull/1166
