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

[duke]

Changeset: 92e17098
Branch: glass_gtk_bug_squashing
Author:    Thiago Milczarek Sayao <thiago.sayao at gmail.com>
Date:      2025-04-17 08:20:47 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/92e170983545cfde4eca415e875cb25193b70ba6

Improve tests

! tests/system/src/test/java/test/javafx/stage/CenterOnScreenTest.java
! tests/system/src/test/java/test/javafx/stage/FullScreenTests.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/StageTestBase.java
! tests/system/src/test/java/test/robot/javafx/stage/StageAttributesTest.java
- tests/system/src/test/java/test/robot/javafx/stage/StageMixedStatesTest.java