RFR: JDK-8015739: Background of JInternalFrame is located out of JInternalFrame [v2]

[Harshitha Onkar]

> JInternalFrame background color seems to overflow into the border region. This issue is more prominently seen on Windows - Metal LAF (with fractional scaling, as shown below). The primary reason is border scaling issue as observed in  - [JDK-8279614](https://bugs.openjdk.org/browse/JDK-8279614) & [JDK-8282958](https://bugs.openjdk.org/browse/JDK-8282958)
> 
> The fix involves a similar approach as described here https://github.com/openjdk/jdk/pull/7449#issuecomment-1068218648. The test checks the midpoint and corners of borders to check if the internal frame's background color is located out of JInternalFrame.
> 
> ![image](https://user-images.githubusercontent.com/95945681/190233555-a7e00f2c-9003-4c11-84fb-207957838c2f.png)

Harshitha Onkar has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge branch 'master' into JIFBorder_8015739
 - added test summary
 - updated test case
 - Added test case, minor position changes to shadow lines
 - expanded imports
 - JIF Metal Border Scaling - Initial changes

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/10274/files
  - new: https://git.openjdk.org/jdk/pull/10274/files/955265c0..b02179cd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10274&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10274&range=00-01

  Stats: 25148 lines in 921 files changed: 13276 ins; 7013 del; 4859 mod
  Patch: https://git.openjdk.org/jdk/pull/10274.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10274/head:pull/10274

PR: https://git.openjdk.org/jdk/pull/10274