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

[duke]

Changeset: ca1f5ba3
Branch: glass_gtk_bug_squashing
Author:    Thiago Milczarek Sayao <thiago.sayao at gmail.com>
Date:      2025-04-21 20:07:56 +0000
URL:       https://git.openjdk.org/jfx-sandbox/commit/ca1f5ba3ed46f068b9d8476df033b1ee011cc14b

Fix tests

! modules/javafx.graphics/src/main/native-glass/gtk/glass_window.cpp
! modules/javafx.graphics/src/main/native-glass/gtk/glass_window.h
! tests/system/src/test/java/test/javafx/stage/FullScreenTest.java
! tests/system/src/test/java/test/robot/javafx/stage/StageMixedSizeTest.java