<Swing Dev> RFR: 8015602: [macosx] Test javax/swing/SpringLayout/4726194/bug4726194.java fails on MacOSX

[Sergey Bylokhov]

The test fails on macOS when Aqua L&F is enabled:
> Test4 works well for all our LaFs because they set symmetrical insets for the JTextField, when Aqua sets 6 points for top/bottom and 7 for left/right which breaks the testing routine with the hardcoded values. The empty border should be set for the tested JTextField.
https://bugs.openjdk.java.net/browse/JDK-7124209?focusedCommentId=12231936&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-12231936

Mixed story of this bug.

1. Initially it was found by https://bugs.openjdk.java.net/browse/JDK-7124209
   but for some reason the change for that bug missed the actual fix and just moved the test to the open repo.

2. But it did not appear as failed because it was problemlisted by the
    https://bugs.openjdk.java.net/browse/JDK-8198399
3. Recently it was de-problemlisted by the 
   https://bugs.openjdk.java.net/browse/JDK-8254976
4. But the check via mach5 missed this issue, becouse on the headless systems default L&F is Metal not Aqua.

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Commit messages:
 - Update bug4726194.java

Changes: https://git.openjdk.java.net/jdk/pull/872/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=872&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8015602
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/872.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/872/head:pull/872

PR: https://git.openjdk.java.net/jdk/pull/872