separators support for content

platform/platform-api/src/com/intellij/ui/content/Content.java

@@ -114,4 +114,6 @@ public interface Content extends UserDataHolder, ComponentContainer {
   BusyObject getBusyObject();
   void setBusyObject(BusyObject object);
 
+  String getSeparator();
+  void setSeparator(String separator);
 }

platform/platform-impl/src/com/intellij/ui/content/impl/ContentImpl.java

@@ -56,6 +56,7 @@ public class ContentImpl extends UserDataHolderBase implements Content {
 
   private Computable<JComponent> myFocusRequest;
   private BusyObject myBusyObject;
+  private String mySeparator;
 
   public ContentImpl(JComponent component, String displayName, boolean isPinnable) {
     myComponent = component;
@@ -278,6 +279,16 @@ public class ContentImpl extends UserDataHolderBase implements Content {
     myBusyObject = object;
   }
 
+  @Override
+  public String getSeparator() {
+    return mySeparator;
+  }
+
+  @Override
+  public void setSeparator(String separator) {
+    mySeparator = separator;
+  }
+
   @Override
   public BusyObject getBusyObject() {
     return myBusyObject;