Index: src/main/java/hudson/scm/RevisionParameterAction.java
===================================================================
--- src/main/java/hudson/scm/RevisionParameterAction.java	(revision 37442)
+++ src/main/java/hudson/scm/RevisionParameterAction.java	(working copy)
@@ -1,12 +1,17 @@
 package hudson.scm;
 
 import hudson.model.InvisibleAction;
+import hudson.model.Action;
+import hudson.model.Queue;
+import hudson.model.Queue.Task;
+import hudson.model.queue.FoldableAction;
 import hudson.scm.SubversionSCM.SvnInfo;
 
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.logging.Logger;
 
 import org.tmatesoft.svn.core.wc.SVNRevision;
 
@@ -15,8 +20,10 @@
  * 
  * @author Tom Huybrechts
  */
-public class RevisionParameterAction extends InvisibleAction implements Serializable {
+public class RevisionParameterAction extends InvisibleAction implements Serializable, FoldableAction {
 	
+	private static final long serialVersionUID = 1L;
+	private static final Logger LOGGER = Logger.getLogger(RevisionParameterAction.class.getName());
 	private final List<SvnInfo> revisions;
 
 	public RevisionParameterAction(List<SvnInfo> revisions) {
@@ -24,6 +31,11 @@
 		this.revisions = revisions;
 	}
 	
+	public RevisionParameterAction(RevisionParameterAction action) {
+		super();
+		this.revisions = new ArrayList<SvnInfo>(action.revisions);
+	}
+	
 	public RevisionParameterAction(SvnInfo... revisions) {
 		this.revisions = new ArrayList<SvnInfo>(Arrays.asList(revisions));
 	}
@@ -40,5 +52,43 @@
 		}
 		return null;
 	}
+		
+	public void foldIntoExisting(Queue.Item item, Task owner, List<Action> otherActions) {
+        RevisionParameterAction existing = item.getAction(RevisionParameterAction.class);
+        if (existing!=null) {
+            existing.mergeRevisions(this.revisions);
+            return;
+        }
+        // no RevisionParameterAction found, so add a copy of this one
+        item.getActions().add(new RevisionParameterAction(this));
+	}
+	
+	private void mergeRevisions(List<SvnInfo> newRevisions) {
+		
+		for(SvnInfo newRev : newRevisions) {
+			Boolean found = false;
+			for(SvnInfo oldRev : this.revisions) {
+				if(oldRev.url.equals(newRev.url)) {
 
+					LOGGER.info("Updating revision parameter for " + oldRev.url + " from " + oldRev.revision + " to " + newRev.revision);
+
+					this.revisions.add(new SvnInfo(oldRev.url, newRev.revision));
+					this.revisions.remove(oldRev);
+					found = true;
+					break;
+				}
+			}
+			if(!found)
+				this.revisions.add(newRev);
+		}
+	}
+
+	@Override
+	public String toString() {
+		String result = "[RevisionParameterAction ";
+		for(SvnInfo i : revisions) {
+			result += i.url + "(" + i.revision + ") ";
+		}
+		return result + "]";
+	}
 }