RFR: 8288325: [windows] Actual and Preferred Size of AWT Non-resizable frame are different

[Harshitha Onkar]

On Windows, the insets obtained for a Non-Resizable AWT Frame was different when frame.pack() was called and subsequent call to frame.getInsets() or frame.getPreferredSize(). Due to this, the actual and preferred size differed when frame.pack() was called for Non-Resizable frame (on Windows).  

Earlier the insets returned when frame.getInsets() was called was that of a Resizable frame and not the correct insets associated with Non-Resizable frame. Fix is added to native code to get the correct insets. The test - AwtFramePackTest.java has been updated to test actual and expected/preferred size for both Resizable and Non-Resizable Frames.

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Commit messages:
 - Non-Resizable AWT Frame insets fix

Changes: https://git.openjdk.org/jdk/pull/9954/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9954&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288325
  Stats: 49 lines in 2 files changed: 26 ins; 6 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/9954.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9954/head:pull/9954

PR: https://git.openjdk.org/jdk/pull/9954