Refactor KeyButtonTest to improve headless environment setup - Added OS

check for software rendering and conditional Monocle platform
initialization.

Author: comtel2000

.github/workflows/ci.yml

@@ -19,8 +19,6 @@ jobs:
         -Djava.awt.headless=true
         -Dprism.order=sw
         -Dprism.forceGPU=false
-        -Dglass.platform=Monocle
-        -Dmonocle.platform=Headless
     steps:
     - uses: actions/checkout@v4
     - name: Set up JDK ${{ matrix.java-version }}

.github/workflows/maven-deploy.yml

@@ -12,8 +12,6 @@ jobs:
         -Djava.awt.headless=true
         -Dprism.order=sw
         -Dprism.forceGPU=false
-        -Dglass.platform=Monocle
-        -Dmonocle.platform=Headless
     environment: OSSRH
     steps:
       - uses: actions/checkout@v4

.github/workflows/maven-publish.yml

@@ -14,8 +14,6 @@ jobs:
         -Djava.awt.headless=true
         -Dprism.order=sw
         -Dprism.forceGPU=false
-        -Dglass.platform=Monocle
-        -Dmonocle.platform=Headless
     environment: OSSRH
     name: Publish artifact via Central Portal
     steps:

.github/workflows/maven-release.yml

@@ -15,8 +15,6 @@ jobs:
         -Djava.awt.headless=true
         -Dprism.order=sw
         -Dprism.forceGPU=false
-        -Dglass.platform=Monocle
-        -Dmonocle.platform=Headless
     environment: OSSRH
     name: Publish artifact via Central Portal
     steps:

fx-onscreen-keyboard/src/test/java/org/comtel2000/keyboard/control/KeyButtonTest.java

@@ -23,14 +23,24 @@ class KeyButtonTest {
 
   @BeforeAll
   static void initToolkit() throws Exception {
-    if (!OS.WINDOWS.isCurrentOs()) {
+    if (OS.WINDOWS.isCurrentOs()) {
       // Ensure headless property is set early in CI via JAVA_TOOL_OPTIONS; this is
       // just in case.
       System.setProperty("java.awt.headless", System.getProperty("java.awt.headless", "true"));
       System.setProperty("prism.order", "sw");
       System.setProperty("prism.forceGPU", "false");
-      System.setProperty("glass.platform", "Monocle");
-      System.setProperty("monocle.platform", "Headless");
+      
+      // Monocle platform is not available on all systems (e.g., Linux with JDK 25)
+      // Only set it if the Glass factory class is available
+      try {
+        Class.forName("com.sun.glass.ui.monocle.MonoclePlatformFactory");
+        System.setProperty("glass.platform", "Monocle");
+        System.setProperty("monocle.platform", "Headless");
+      } catch (ClassNotFoundException ex) {
+        // Monocle not available, use default glass implementation
+        System.err.println("Monocle platform not available, using default glass implementation");
+      }
+      
     }
     // Initialize JavaFX toolkit (safe if already started)
     try {