git: openjdk/jdk21u-dev: master: 8315600: Open source few more headless Swing misc tests

[Aleksey Shipilev]

Changeset: 45b428fc
Author:    Amos Shi <ashi at openjdk.org>
Committer: Aleksey Shipilev <shade at openjdk.org>
Date:      2024-01-30 08:18:38 +0000
URL:       https://git.openjdk.org/jdk21u-dev/commit/45b428fc975b77eaf37bb7658a1f4cc8d425d339

8315600: Open source few more headless Swing misc tests

Backport-of: b05198a4f354934bc344fe9cbc19d98fd8bc3977

+ test/jdk/javax/swing/tree/FixedHeightLayoutCache/bug4210354.java
+ test/jdk/javax/swing/undo/UndoManager/bug4706533.java
+ test/jdk/javax/swing/undo/bug4992178.java