Reset internal state canonical length in WorkingTreeIterator when moving

Bug: 426514
Change-Id: Ifb75a4fa12291aeeece3dda129a65f0c1fd5e0eb
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/FileTreeIteratorTest.java

@@ -56,9 +56,9 @@ import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.dircache.DirCache;
 import org.eclipse.jgit.dircache.DirCacheCheckout;
 import org.eclipse.jgit.dircache.DirCacheEditor;
+import org.eclipse.jgit.dircache.DirCacheEditor.PathEdit;
 import org.eclipse.jgit.dircache.DirCacheEntry;
 import org.eclipse.jgit.dircache.DirCacheIterator;
-import org.eclipse.jgit.dircache.DirCacheEditor.PathEdit;
 import org.eclipse.jgit.errors.CorruptObjectException;
 import org.eclipse.jgit.errors.IncorrectObjectTypeException;
 import org.eclipse.jgit.errors.MissingObjectException;
@@ -98,6 +98,19 @@ public class FileTreeIteratorTest extends RepositoryTestCase {
 		}
 	}
 
+	@Test
+	public void testGetEntryContentLength() throws Exception {
+		final FileTreeIterator fti = new FileTreeIterator(db);
+		fti.next(1);
+		assertEquals(3, fti.getEntryContentLength());
+		fti.back(1);
+		assertEquals(2, fti.getEntryContentLength());
+		fti.next(1);
+		assertEquals(3, fti.getEntryContentLength());
+		fti.reset();
+		assertEquals(2, fti.getEntryContentLength());
+	}
+
 	@Test
 	public void testEmptyIfRootIsFile() throws Exception {
 		final File r = new File(trash, paths[0]);

org.eclipse.jgit/src/org/eclipse/jgit/treewalk/WorkingTreeIterator.java

@@ -465,7 +465,6 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 	public void next(final int delta) throws CorruptObjectException {
 		ptr += delta;
 		if (!eof()) {
-			canonLen = -1;
 			parseEntry();
 		}
 	}
@@ -484,6 +483,7 @@ public abstract class WorkingTreeIterator extends AbstractTreeIterator {
 		ensurePathCapacity(pathOffset + nameLen, pathOffset);
 		System.arraycopy(e.encodedName, 0, path, pathOffset, nameLen);
 		pathLen = pathOffset + nameLen;
+		canonLen = -1;
 	}
 
 	/**