UnsupportedOperationException with LexicalPreservingPrinter when removing a sealed modified

[blacelle]

In #3935, some issue led to a workaround requesting to drop all modifiers (before applying new ones). This workaround leads to issue with LexicalPreservingPrinter and sealed classes (JDK17).

Here is a reproduction case:

import com.github.javaparser.ParserConfiguration;
import com.github.javaparser.ParserConfiguration.LanguageLevel;
import com.github.javaparser.StaticJavaParser;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.printer.lexicalpreservation.LexicalPreservingPrinter;
import com.github.javaparser.symbolsolver.JavaSymbolSolver;
import com.github.javaparser.symbolsolver.resolution.typesolvers.ReflectionTypeSolver;

// https://github.com/solven-eu/cleanthat/issues/713
public class SealedPermitsParsing {
	static final String testCase =
			"public sealed interface IUpdatePortCommand permits UpdateScheduleCommand, UpdateStateCommand {}";

	public static void main(String[] args) {
		System.out.println(testCase);

		ParserConfiguration parserConfiguration = new ParserConfiguration();
		parserConfiguration.setLanguageLevel(LanguageLevel.JAVA_17);
		StaticJavaParser.setConfiguration(
				parserConfiguration.setSymbolResolver(new JavaSymbolSolver(new ReflectionTypeSolver(true))));
		var unit = StaticJavaParser.parse(testCase);

		unit = LexicalPreservingPrinter.setup(unit);

		ClassOrInterfaceDeclaration classOrInterface = unit.findFirst(ClassOrInterfaceDeclaration.class).get();
		classOrInterface.setModifiers();

		System.out.println(classOrInterface);
	}
}

It fails with:

Exception in thread "main" java.lang.UnsupportedOperationException: Csm token CsmToken(property:{) NodeText TOKEN "permits"   <46>   (line 1,col 44)-(line 1,col 50)
	at com.github.javaparser.printer.lexicalpreservation.Difference.applyKeptDiffElement(Difference.java:655)
	at com.github.javaparser.printer.lexicalpreservation.Difference.apply(Difference.java:363)
	at com.github.javaparser.printer.lexicalpreservation.LexicalDifferenceCalculator.calculatePropertyChange(LexicalDifferenceCalculator.java:176)
	at com.github.javaparser.printer.lexicalpreservation.LexicalPreservingPrinter$Observer.concretePropertyChange(LexicalPreservingPrinter.java:199)
	at com.github.javaparser.ast.observer.PropagatingAstObserver.propertyChange(PropagatingAstObserver.java:62)
	at com.github.javaparser.ast.Node.lambda$notifyPropertyChange$7(Node.java:629)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
	at com.github.javaparser.ast.Node.notifyPropertyChange(Node.java:629)
	at com.github.javaparser.ast.body.TypeDeclaration.setModifiers(TypeDeclaration.java:133)
	at com.github.javaparser.ast.body.TypeDeclaration.setModifiers(TypeDeclaration.java:51)
	at com.github.javaparser.ast.nodeTypes.NodeWithModifiers.setModifiers(NodeWithModifiers.java:96)
	at eu.solven.cleanthat.engine.java.refactorer.report_javaparser.SealedPermitsParsing.main(SealedPermitsParsing.java:43)

[jlerbsc]

This is a missing feature in Concrete Syntax Model.