remove trailing whitespace

src/bk/Compaction.java

@@ -158,7 +158,7 @@ public class Compaction implements AlgorithmStage{
 						else // nein
 						{
 						    // tue nix
-							sf.w.setSelected( layout ); 
+							sf.w.setSelected( layout );
 							actions.add( 0, ()-> {
 								stack.get( 0 ).u = null;
 							});