Restore and modernize GC.setClipping() tests

These tests were disabled with 991d280
due to sporadic failures on Windows XP. Given that this operating system
is no longer supported and given that this was over 20 years ago, a lot
might have changed and the reason those tests were failing might no
longer apply.

Author: ptziegler

tests/org.eclipse.swt.tests/JUnit Tests/org/eclipse/swt/tests/junit/Test_org_eclipse_swt_graphics_GC.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2016 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -16,6 +16,7 @@
 
 import static org.eclipse.swt.internal.DPIUtil.pointToPixel;
 import static org.eclipse.swt.tests.junit.SwtTestUtil.assertSWTProblem;
+import static org.junit.jupiter.api.Assertions.assertAll;
 import static org.junit.jupiter.api.Assertions.assertArrayEquals;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -793,40 +794,24 @@ public void test_setBackgroundLorg_eclipse_swt_graphics_Color() {
 
 @Test
 public void test_setClippingIIII() {
-	// intermittently fails on XP for reasons unknown, comment out the test case
-	// until the problem is figured out
-//	Canvas canvas = new Canvas(shell, SWT.BORDER);
-//	shell.setSize(110,110);
-//	canvas.setSize(100,100);
-//	shell.open();
-//	GC testGc = new GC(canvas);
-//	testGc.setClipping(0,5,10,20);
-//	Rectangle rect = testGc.getClipping();
-//	assertTrue(rect.x == 0);
-//	assertTrue(rect.y == 5);
-//	assertTrue(rect.width == 10);
-//	assertTrue(rect.height == 20);
-//	testGc.dispose();
-//	canvas.dispose();
+	gc.setClipping(0,5,10,20);
+	Rectangle rect = gc.getClipping();
+	assertAll(
+		() -> assertEquals(0,rect.x),
+		() -> assertEquals(5, rect.y),
+		() -> assertEquals(10,rect.width),
+		() -> assertEquals(20,rect.height));
 }
 
 @Test
 public void test_setClippingLorg_eclipse_swt_graphics_Rectangle() {
-	// intermittently fails on XP for reasons unknown, comment out the test case
-	// until the problem is figured out
-//	Canvas canvas = new Canvas(shell, SWT.BORDER);
-//	shell.setSize(110,110);
-//	canvas.setSize(100,100);
-//	shell.open();
-//	GC testGc = new GC(canvas);
-//	testGc.setClipping(new Rectangle(0,5,10,20));
-//	Rectangle rect = testGc.getClipping();
-//	assertTrue(rect.x == 0);
-//	assertTrue(rect.y == 5);
-//	assertTrue(rect.width == 10);
-//	assertTrue(rect.height == 20);
-//	testGc.dispose();
-//	canvas.dispose();
+	gc.setClipping(new Rectangle(0,5,10,20));
+	Rectangle rect = gc.getClipping();
+	assertAll(
+		() -> assertEquals(0,rect.x),
+		() -> assertEquals(5, rect.y),
+		() -> assertEquals(10,rect.width),
+		() -> assertEquals(20,rect.height));
 }
 
 @Test