Fix SwitchFixOperation to not cause a MalformedTreeException (#1511)

* Fix SwitchFixOperation to not cause a MalformedTreeException

- fix SwitchFixCore.SwitchFixOperation to copy the remaining statement
  without extended range to avoid a mismatch of length when the
  original if statement is replaced
- add trailing comment to test in CleanUpTest12 to emulate
  circumstances of failure
- fixes #1509

* Remove unused code

org.eclipse.jdt.core.manipulation/core extension/org/eclipse/jdt/internal/corext/fix/SwitchFixCore.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2021, 2022 Fabrice TIERCELIN and others.
+ * Copyright (c) 2021, 2024 Fabrice TIERCELIN and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -354,6 +354,7 @@ public SourceRange computeSourceRange(final ASTNode nodeWithComment) {
 			}
 
 			if (remainingStatement != null) {
+				remainingStatement.setProperty(UNTOUCH_COMMENT_PROPERTY, Boolean.TRUE);
 				addCaseWithStatements(rewrite, ast, switchStatement, null, ASTNodes.asList(remainingStatement));
 			} else {
 				addCaseWithStatements(rewrite, ast, switchStatement, null, Collections.emptyList());
@@ -393,7 +394,7 @@ private void addCaseWithStatements(final ASTRewrite rewrite, final AST ast, fina
 			// Add the statement(s) for this case(s)
 			if (!innerStatements.isEmpty()) {
 				for (Statement statement : innerStatements) {
-					statementsList.add(ASTNodes.createMoveTarget(rewrite, statement));
+					statementsList.add((Statement) rewrite.createCopyTarget(statement));
 				}
 
 				isBreakNeeded= !ASTNodes.fallsThrough(innerStatements.get(innerStatements.size() - 1));