Upgrade to CleanThat 2.16. Include management of JDK17 Sealed classes for Unnecessaryimports

Author: blacelle

lib/build.gradle

@@ -70,7 +70,7 @@ dependencies {
 
 	// GLUE CODE (alphabetic order please)
 	// cleanthat
-	String VER_CLEANTHAT='2.13'
+	String VER_CLEANTHAT='2.16'
 	cleanthatCompileOnly "io.github.solven-eu.cleanthat:java:$VER_CLEANTHAT"
 	compatCleanthat2Dot1CompileAndTestOnly "io.github.solven-eu.cleanthat:java:$VER_CLEANTHAT"
 	// diktat

lib/src/main/java/com/diffplug/spotless/java/CleanthatJavaStep.java

@@ -40,7 +40,7 @@ public final class CleanthatJavaStep {
 	private static final String MAVEN_COORDINATE = "io.github.solven-eu.cleanthat:java";
 
 	// CleanThat changelog is available at https://github.com/solven-eu/cleanthat/blob/master/CHANGES.MD
-	private static final Jvm.Support<String> JVM_SUPPORT = Jvm.<String> support(NAME).add(11, "2.13");
+	private static final Jvm.Support<String> JVM_SUPPORT = Jvm.<String> support(NAME).add(11, "2.16");
 
 	// prevent direct instantiation
 	private CleanthatJavaStep() {}

testlib/src/main/resources/java/removeunusedimports/SealedClassTestsFormatted.test

@@ -14,7 +14,6 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
 
 import org.junit.jupiter.api.Test;
-
 class SealedClassTests extends AbstractJupiterTestEngineTests {
 
 	@Test

testlib/src/test/java/com/diffplug/spotless/java/RemoveUnusedImportsStep_withCleanthatJavaparserTest.java

@@ -33,8 +33,7 @@ void behavior() throws Exception {
 				.testResource("java/removeunusedimports/JavaCodeWithPackageUnformatted.test", "java/removeunusedimports/JavaCodeWithPackageFormatted.test")
 				.testResource("java/removeunusedimports/Jdk17TextBlockUnformatted.test", "java/removeunusedimports/Jdk17TextBlockFormatted.test")
 				.testResource("java/removeunusedimports/RevelcUnformatted.test", "java/removeunusedimports/RevelcFormatted.test")
-				// Sealed classes are introduced with JDK15: This syntax is not supported by javaParser: such files are not trimmed from unused imports (for now)
-				.testResource("java/removeunusedimports/SealedClassTestsUnformatted.test", "java/removeunusedimports/SealedClassTestsUnformatted.test");
+				.testResource("java/removeunusedimports/SealedClassTestsUnformatted.test", "java/removeunusedimports/SealedClassTestsFormatted.test");
 	}
 
 	@Test