Revert "Let ObjectWalk.markUninteresting also mark the root tree as"

The Iff2de881 tried to fix missing tree ..." but introduced severe
performance degradation (>10x in some cases) when acting as server
(git push) and as client (replication). IOW cure is worse than the
disease.

This reverts commit c4797fe986.

Change-Id: I4e6056eb352d51277867f857a0cab380eca153ac
Signed-off-by: David Ostrovsky <david@ostrovsky.org>

org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/ObjectWalkTest.java

@@ -214,21 +214,6 @@ public class ObjectWalkTest extends RevWalkTestCase {
 		assertNull(objw.nextObject());
 	}
 
-	@Test
-	public void testMarkUninterestingPropagation() throws Exception {
-		final RevBlob f = blob("1");
-		final RevTree t = tree(file("f", f));
-		final RevCommit c1 = commit(t);
-		final RevCommit c2 = commit(t);
-
-		markUninteresting(c1);
-		markStart(c2);
-
-		assertSame(c2, objw.next());
-		assertNull(objw.next());
-		assertNull(objw.nextObject());
-	}
-
 	@Test
 	public void testEmptyTreeCorruption() throws Exception {
 		ObjectId bId = ObjectId

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/ObjectWalk.java

@@ -232,7 +232,7 @@ public class ObjectWalk extends RevWalk {
 		}
 
 		if (o instanceof RevCommit)
-			markUninteresting((RevCommit) o);
+			super.markUninteresting((RevCommit) o);
 		else if (o instanceof RevTree)
 			markTreeUninteresting((RevTree) o);
 		else
@@ -242,18 +242,6 @@ public class ObjectWalk extends RevWalk {
 			addObject(o);
 	}
 
-	@Override
-	public void markUninteresting(RevCommit c) throws MissingObjectException,
-			IncorrectObjectTypeException, IOException {
-		super.markUninteresting(c);
-		try {
-			markTreeUninteresting(c.getTree());
-		} catch (MissingObjectException e) {
-			// we don't care if the tree of the commit does not exist locally
-		}
-	}
-
-	@Override
 	public void sort(RevSort s) {
 		super.sort(s);
 		boundary = hasRevSort(RevSort.BOUNDARY);