Due to incorrect AWT Frame inset values being returned from native code, few of the components in the frame were not being shown completely on Windows. With the proposed fix, correct insets are obtained which in turn sizes and displays the frame correctly.
The default insets obtained from the Win system was adding only `::GetSystemMetrics(SM_CXSIZEFRAME)` for **WS_THICKFRAME** and the insets were off by 6px from the expected value. `::GetSystemMetrics(SM_CXPADDEDBORDER)` is additionally added to top, bottom, left and right insets to account for the 6px. [GetSystemMetric() Document](https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-getsystemmetrics) A test case is added which checks if the actual frame size is equal to the expected frame size (frame.getSize() == frame.getPreferredSize()), thus checking if frame.pack() works as expected. Following are before and after screenshots -  ------------- Commit messages: - removed extra newline - AWT frame.pack fix Changes: https://git.openjdk.org/jdk/pull/9118/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9118&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8265586 Stats: 120 lines in 2 files changed: 114 ins; 3 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/9118.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9118/head:pull/9118 PR: https://git.openjdk.org/jdk/pull/9118
