git: openjdk/jfx-sandbox: glass_gtk_bug_squashing: Improve testing

[duke]

Changeset: 53b09d9d
Branch: glass_gtk_bug_squashing
Author:    Thiago Milczarek Sayao <thiago.sayao at gmail.com>
Date:      2025-04-13 14:53:54 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/53b09d9dcb13704a5617217462e4637cf489f224

Improve testing

= tests/system/src/test/java/test/javafx/stage/CenterOnScreenTest.java
= tests/system/src/test/java/test/javafx/stage/HonorGeometryChangeOnRestoreTest.java
+ tests/system/src/test/java/test/javafx/stage/KeepGeometryOnStateTest.java
+ tests/system/src/test/java/test/javafx/stage/MaximizeUndecoratedTest.java
= tests/system/src/test/java/test/javafx/stage/ResizeUnresizableTest.java
- tests/system/src/test/java/test/javafx/stage/RestoreStagePositionTest.java
- tests/system/src/test/java/test/javafx/stage/StageKeepPropertiesWhileNotFloatingTest.java
- tests/system/src/test/java/test/javafx/stage/StageMaximizeUndecoratedTest.java
! tests/system/src/test/java/test/javafx/stage/StageTestBase.java
! tests/system/src/test/java/test/util/Util.java