git: openjdk/jdk21u-dev: master: 8353213: Open source several swing tests batch3

[Satyen Subramaniam]

Changeset: 1f540905
Branch: master
Author:    Satyen Subramaniam <ssubramaniam at openjdk.org>
Date:      2025-08-21 16:36:18 +0000
URL:       https://git.openjdk.org/jdk21u-dev/commit/1f5409058714c2af8afa69b7a0efed971f9e5c81

8353213: Open source several swing tests batch3

Backport-of: e639cd6a775fabb057b684c70f85b94f84fa5d04

+ test/jdk/javax/swing/plaf/basic/BasicInternalFrameTitlePane/bug4331515.java
+ test/jdk/javax/swing/plaf/basic/BasicSplitPaneDivider/AddMouseListenerTest.java
+ test/jdk/javax/swing/plaf/basic/BasicToolBarUI/bug4305622.java
+ test/jdk/javax/swing/plaf/basic/BasicToolBarUI/bug4331392.java