Perform clean code of team/bundles/org.eclipse.team.genericeditor.diff.extension

Author: eclipse-platform-bot

team/bundles/org.eclipse.team.genericeditor.diff.extension/src/org/eclipse/team/internal/genericeditor/diff/extension/partitioner/DiffPartitioner.java

@@ -24,8 +24,7 @@ public class DiffPartitioner implements IDocumentSetupParticipant{
 	public void setup(IDocument document) {
 		IPartitionTokenScanner scanner = new DiffPartitionScanner();
 		FastPartitioner partitioner = new FastPartitioner(scanner, IDiffPartitioning.LEGAL_PARTITION_TYPES);
-		if (document instanceof IDocumentExtension3) {
-			final IDocumentExtension3 extension3 = (IDocumentExtension3) document;
+		if (document instanceof final IDocumentExtension3 extension3) {
 			extension3.setDocumentPartitioner(IDiffPartitioning.DIFF_PARTITIONINING, partitioner);
 		} else {
 			document.setDocumentPartitioner(partitioner);