IDEA-19061 Integrate the Rearranger-plugin into core-IDEA

Fix UI glitches at the arrangement settings UI (configure arrangement tree in a way to avoid using the same height for all rows)

platform/lang-impl/src/com/intellij/application/options/codeStyle/arrangement/ArrangementRuleTree.java

@@ -138,6 +138,7 @@ public class ArrangementRuleTree {
       };
     myTree.setSelectionModel(mySelectionModel);
     myTree.setRootVisible(false);
+    myTree.setRowHeight(0); // Don't insist on the same row height
     mySelectionModel.addTreeSelectionListener(new TreeSelectionListener() {
       @Override
       public void valueChanged(TreeSelectionEvent e) {