Remove rework check for dependencies in RebaseSorter

The REWORK check that was added by me in Change 91703, is just to be
cautious. However, after some thoughts about this, I don't think it is
really necessary based on the following facts:

* The diff of the change (which based on some old ps of its parent
change) has been reviewed.
* If there was a major rework on the parent change, there will be a merge
conflict when the change is merged.

Change-Id: Iabf544e8a119e262dd54e78d470af2e2800cfe4b

gerrit-acceptance-framework/src/test/java/com/google/gerrit/acceptance/AbstractDaemonTest.java

@@ -648,14 +648,27 @@ public abstract class AbstractDaemonTest {
       String changeId, String ref, TestAccount testAccount, TestRepository<?> repo)
       throws Exception {
     Collections.shuffle(RANDOM);
+    return amendChange(changeId, ref, testAccount, repo, PushOneCommit.SUBJECT,
+        PushOneCommit.FILE_NAME, new String(Chars.toArray(RANDOM)));
+  }
+
+  protected PushOneCommit.Result amendChange(String changeId, String subject, String fileName,
+      String content) throws Exception {
+    return amendChange(changeId, "refs/for/master", admin, testRepo, subject, fileName, content);
+  }
+
+  protected PushOneCommit.Result amendChange(
+      String changeId, String ref, TestAccount testAccount, TestRepository<?> repo, String subject,
+      String fileName, String content)
+      throws Exception {
     PushOneCommit push =
         pushFactory.create(
             db,
             testAccount.getIdent(),
             repo,
-            PushOneCommit.SUBJECT,
-            PushOneCommit.FILE_NAME,
-            new String(Chars.toArray(RANDOM)),
+            subject,
+            fileName,
+            content,
             changeId);
     return push.to(ref);
   }

gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/rest/change/AbstractSubmitByRebase.java

@@ -412,6 +412,27 @@ public abstract class AbstractSubmitByRebase extends AbstractSubmit {
     submit(change2.getChangeId());
   }
 
+  @Test
+  @TestProjectInput(useContentMerge = InheritableBoolean.TRUE)
+  public void submitChainFailsOnRework() throws Exception {
+    PushOneCommit.Result change1 = createChange("subject 1", "fileName 1", "content 1");
+    RevCommit headAfterChange1 = change1.getCommit();
+    PushOneCommit.Result change2 = createChange("subject 2", "fileName 2", "content 2");
+    testRepo.reset(headAfterChange1);
+    change1 = amendChange(change1.getChangeId(), "subject 1 amend", "fileName 2",
+        "rework content 2");
+    submit(change1.getChangeId());
+    headAfterChange1 = getRemoteHead();
+
+    submitWithConflict(
+        change2.getChangeId(),
+        "Cannot rebase "
+            + change2.getCommit().getName()
+            + ": "
+            + "The change could not be rebased due to a conflict during merge.");
+    assertThat(getRemoteHead()).isEqualTo(headAfterChange1);
+  }
+
   @Test
   @TestProjectInput(useContentMerge = InheritableBoolean.TRUE)
   public void submitChainOneByOneManualRebase() throws Exception {

gerrit-server/src/main/java/com/google/gerrit/server/git/RebaseSorter.java

@@ -14,11 +14,8 @@
 
 package com.google.gerrit.server.git;
 
-import com.google.gerrit.extensions.client.ChangeKind;
 import com.google.gerrit.reviewdb.client.Branch;
 import com.google.gerrit.reviewdb.client.Change.Status;
-import com.google.gerrit.reviewdb.client.Project;
-import com.google.gerrit.server.change.ChangeKindCache;
 import com.google.gerrit.server.git.CodeReviewCommit.CodeReviewRevWalk;
 import com.google.gerrit.server.git.strategy.CommitMergeStatus;
 import com.google.gerrit.server.query.change.ChangeData;
@@ -32,8 +29,6 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
-import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevFlag;
 import org.slf4j.Logger;
@@ -47,24 +42,18 @@ public class RebaseSorter {
   private final RevCommit initialTip;
   private final Set<RevCommit> alreadyAccepted;
   private final InternalChangeQuery internalChangeQuery;
-  private final ChangeKindCache changeKindCache;
-  private final Repository repo;
 
   public RebaseSorter(
       CodeReviewRevWalk rw,
       RevCommit initialTip,
       Set<RevCommit> alreadyAccepted,
       RevFlag canMergeFlag,
-      InternalChangeQuery internalChangeQuery,
-      ChangeKindCache changeKindCache,
-      Repository repo) {
+      InternalChangeQuery internalChangeQuery) {
     this.rw = rw;
     this.canMergeFlag = canMergeFlag;
     this.initialTip = initialTip;
     this.alreadyAccepted = alreadyAccepted;
     this.internalChangeQuery = internalChangeQuery;
-    this.changeKindCache = changeKindCache;
-    this.repo = repo;
   }
 
   public List<CodeReviewCommit> sort(Collection<CodeReviewCommit> incoming) throws IOException {
@@ -127,8 +116,7 @@ public class RebaseSorter {
       List<ChangeData> changes = internalChangeQuery.byCommit(commit);
       for (ChangeData change : changes) {
         if (change.change().getStatus() == Status.MERGED
-            && change.change().getDest().equals(dest)
-            && !isRework(dest.getParentKey(), commit, change)) {
+            && change.change().getDest().equals(dest)) {
           log.debug(
               "Dependency {} associated with merged change {}.", commit.getName(), change.getId());
           return true;
@@ -140,14 +128,6 @@ public class RebaseSorter {
     }
   }
 
-  private boolean isRework(Project.NameKey project, RevCommit oldCommit, ChangeData change)
-      throws OrmException, IOException {
-    RevCommit currentCommit =
-        rw.parseCommit(ObjectId.fromString(change.currentPatchSet().getRevision().get()));
-    return ChangeKind.REWORK
-        == changeKindCache.getChangeKind(project, repo, oldCommit, currentCommit);
-  }
-
   private static <T> T removeOne(final Collection<T> c) {
     final Iterator<T> i = c.iterator();
     final T r = i.next();

gerrit-server/src/main/java/com/google/gerrit/server/git/strategy/RebaseSubmitStrategy.java

@@ -295,9 +295,7 @@ public class RebaseSubmitStrategy extends SubmitStrategy {
               args.mergeTip.getInitialTip(),
               args.alreadyAccepted,
               args.canMergeFlag,
-              args.internalChangeQuery,
-              args.changeKindCache,
-              args.repo)
+              args.internalChangeQuery)
           .sort(toSort);
     } catch (IOException e) {
       throw new IntegrationException("Commit sorting failed", e);

gerrit-server/src/main/java/com/google/gerrit/server/git/strategy/SubmitStrategy.java

@@ -31,7 +31,6 @@ import com.google.gerrit.server.GerritPersonIdent;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.PatchSetUtil;
 import com.google.gerrit.server.account.AccountCache;
-import com.google.gerrit.server.change.ChangeKindCache;
 import com.google.gerrit.server.change.RebaseChangeOp;
 import com.google.gerrit.server.extensions.events.ChangeMerged;
 import com.google.gerrit.server.git.CodeReviewCommit;
@@ -123,7 +122,6 @@ public abstract class SubmitStrategy {
     final OnSubmitValidators.Factory onSubmitValidatorsFactory;
     final TagCache tagCache;
     final InternalChangeQuery internalChangeQuery;
-    final ChangeKindCache changeKindCache;
 
     final Branch.NameKey destBranch;
     final CodeReviewRevWalk rw;
@@ -167,7 +165,6 @@ public abstract class SubmitStrategy {
         OnSubmitValidators.Factory onSubmitValidatorsFactory,
         TagCache tagCache,
         InternalChangeQuery internalChangeQuery,
-        ChangeKindCache changeKindCache,
         @Assisted Branch.NameKey destBranch,
         @Assisted CommitStatus commitStatus,
         @Assisted CodeReviewRevWalk rw,
@@ -200,7 +197,6 @@ public abstract class SubmitStrategy {
       this.rebaseFactory = rebaseFactory;
       this.tagCache = tagCache;
       this.internalChangeQuery = internalChangeQuery;
-      this.changeKindCache = changeKindCache;
 
       this.serverIdent = serverIdent;
       this.destBranch = destBranch;