Refactor headless property setup in KeyButtonTest - Moved software

rendering configuration for non-Windows OS into a conditional block for
clarity

Author: comtel2000

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

@@ -7,27 +7,31 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
-import javafx.animation.Animation;
-import javafx.application.Platform;
-import javafx.scene.input.MouseButton;
-import javafx.scene.input.MouseEvent;
+
 import org.junit.jupiter.api.AssertionFailureBuilder;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Timeout;
+import org.junit.jupiter.api.condition.OS;
+
+import javafx.animation.Animation;
+import javafx.application.Platform;
+import javafx.scene.input.MouseButton;
+import javafx.scene.input.MouseEvent;
 
 class KeyButtonTest {
 
   @BeforeAll
   static void initToolkit() throws Exception {
-    // 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");
-
+    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");
+    }
     // Initialize JavaFX toolkit (safe if already started)
     try {
       Platform.startup(
@@ -36,7 +40,7 @@ static void initToolkit() throws Exception {
           });
     } catch (IllegalStateException ex) {
       // toolkit already started
-    } catch (NullPointerException | RuntimeException ex) {
+    } catch (RuntimeException ex) {
       // Handle glass platform initialization failures in JDK 25+
       // This can occur when the glass platform factory is not properly initialized
       System.err.println("Warning: Failed to initialize JavaFX toolkit: " + ex.getMessage());