Run.toString() should use internal, not display names, since it may be used in logging.

UI elements should explicitly ask for .fullDisplayName.

core/src/main/java/hudson/matrix/MatrixBuild.java

@@ -100,7 +100,7 @@ public class MatrixBuild extends AbstractBuild<MatrixProject,MatrixBuild> {
         // due to dependencies!
         String why = getWhyKeepLog();
         if (why!=null) {
-            sendError(hudson.model.Messages.Run_UnableToDelete(toString(),why),req,rsp);
+            sendError(hudson.model.Messages.Run_UnableToDelete(getFullDisplayName(), why), req, rsp);
             return;
         }
         
@@ -108,7 +108,7 @@ public class MatrixBuild extends AbstractBuild<MatrixProject,MatrixBuild> {
         for(MatrixRun run : runs){
         	why = run.getWhyKeepLog();
             if (why!=null) {
-                sendError(hudson.model.Messages.Run_UnableToDelete(toString(),why),req,rsp);
+                sendError(hudson.model.Messages.Run_UnableToDelete(getFullDisplayName(), why), req, rsp);
                 return;
             }
         	run.delete();

core/src/main/java/hudson/model/Run.java

@@ -736,7 +736,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
 
     @Override
     public String toString() {
-        return getFullDisplayName();
+        return project.getFullName() + " #" + number;
     }
 
     @Exported
@@ -2121,7 +2121,7 @@ public abstract class Run <JobT extends Job<JobT,RunT>,RunT extends Run<JobT,Run
         // due to dependencies!
         String why = getWhyKeepLog();
         if (why!=null) {
-            sendError(Messages.Run_UnableToDelete(toString(),why),req,rsp);
+            sendError(Messages.Run_UnableToDelete(getFullDisplayName(), why), req, rsp);
             return;
         }