RFR: 8282936: Write a regression test for JDK-4615365

[Sergey Bylokhov]

On Sun, 13 Mar 2022 13:54:47 GMT, Manukumar V S <mvs at openjdk.org> wrote:

> Write a regression test for [JDK-4615365](https://bugs.openjdk.java.net/browse/JDK-4615365) : JSplitPane current and last divider positions incorrect when realized
> 
> Issue:
> JSplitPane component with a left and right component has its current divider
> position incorrectly set to -1 once it is fully realized. For JDK 1.3.1, its
> value is set to 0. The current position of the divider should be the current
> position of the divider once layout management is complete. If the divider is
> moved one pixel, the current divider position is updated to the correct value
> but the last divider position is then set to -1 (i.e. the last value of the
> current divider position). If the divider is moved again, everything is OK.
> 
> Testing:
> Java 1.4.0 -> Test Failed.
> $ j2sdk1.4.0/bin/java bug4615365
> current= -1, last= 0
> Test Failed.
> 
> Java 1.4.1 -> Test Passed.
> $ j2sdk1.4.1/bin/java bug4615365
> current= 97, last= -1
> Test Passed.

test/jdk/javax/swing/JSplitPane/4615365/JSplitPaneDividerLocationTest.java line 52:

> 50:  * @key headful
> 51:  * @bug 4615365
> 52:  * @summary This test confirms that the JSplitPane current and last divider positions are correct when realized.

Please split the long lines to have 80 chars per line.

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PR: https://git.openjdk.java.net/jdk/pull/7802