Make Shell.setSize() test compatible with fractional scaling

The test case test_setSizeLorg_eclipse_swt_graphics_Point in
Test_org_eclipse_swt_widgets_Shell sporadically fails in I-Builds and
constantly fails when executed locally on a non-100% monitor. Due to
rounding of the point-based size when converting to pixels upon setting
the shell size, the value yielded by getSize() used for result
validation is not necessarily equal. This change adapts the test case to
apply an according tolerance value whenever the shell zoom is not 100%.

Author: HeikoKlare

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

@@ -807,20 +807,31 @@ public void test_setSizeLorg_eclipse_swt_graphics_Point() {
 		Point newSize = new Point(112, 27);
 		for (int i = 0; i < 10; i++) {
 			testShell.setSize(newSize);
-			assertEquals(newSize, testShell.getSize());
+			assertShellProperlySized(testShell, newSize);
 			newSize.x += 100;
 			newSize.y += 100;
 		}
 		newSize = new Point(1292, 1036);
 		for (int i = 0; i < 10; i++) {
 			testShell.setSize(newSize);
-			assertEquals(newSize, testShell.getSize());
+			assertShellProperlySized(testShell, newSize);
 			newSize.x -= 100;
 			newSize.y -= 100;
 		}
 	}
 }
 
+private void assertShellProperlySized(Shell shell, Point expectedSize) {
+	int tolerance = shell.getZoom() != 100 ? 1 : 0;
+	Point actualSize = shell.getSize();
+	assertTrue(
+			Math.abs(expectedSize.x - actualSize.x) <= tolerance
+					&& Math.abs(expectedSize.y - actualSize.y) <= tolerance,
+			"Shell is not sized correctly" //
+					+ " (expected size: " + expectedSize + " ± " + tolerance //
+					+ ", actual size: " + actualSize + ")");
+}
+
 Shell testShell;
 
 private void createShell() {