Merge attached revisions and commits in task detail

Summary:
With freetext fields, most tasks would have attached revisions when they have attached commits.
See T1048 for example.
Merge these two fields together.

Test Plan:
Displayed task with commit and unrelated revision.
Displayed task with commit and related revision:
{F39394,size=full}

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5601

src/applications/maniphest/controller/ManiphestTaskDetailController.php

@@ -493,10 +493,42 @@ final class ManiphestTaskDetailController extends ManiphestController {
         => pht('Depends On'),
       PhabricatorEdgeConfig::TYPE_TASK_HAS_RELATED_DREV
         => pht('Differential Revisions'),
-      PhabricatorEdgeConfig::TYPE_TASK_HAS_COMMIT
-        => pht('Commits'),
     );
 
+    $revisions_commits = array();
+    $handles = $this->getLoadedHandles();
+
+    $commit_phids = array_keys(
+      $edges[PhabricatorEdgeConfig::TYPE_TASK_HAS_COMMIT]);
+    if ($commit_phids) {
+      $commits = id(new PhabricatorRepositoryCommit())
+        ->putInSet(new LiskDAOSet())
+        ->loadAllWhere('phid IN (%Ls)', $commit_phids);
+
+      foreach ($commits as $commit) {
+        $phid = $commit->getPHID();
+        $revisions_commits[$phid] = $handles[$phid]->renderLink();
+
+        $data = $commit->loadOneRelative(
+          new PhabricatorRepositoryCommitData(),
+          'commitID');
+
+        $revision_phid = ($data
+          ? $data->getCommitDetail('differential.revisionPHID')
+          : null);
+
+        $revision_handle = idx($handles, $revision_phid);
+        if ($revision_handle) {
+          $has_drev = PhabricatorEdgeConfig::TYPE_TASK_HAS_RELATED_DREV;
+          unset($edges[$has_drev][$revision_phid]);
+          $revisions_commits[$phid] = hsprintf(
+            '%s / %s',
+            $revision_handle->renderLink($revision_handle->getName()),
+            $revisions_commits[$phid]);
+        }
+      }
+    }
+
     foreach ($edge_types as $edge_type => $edge_name) {
       if ($edges[$edge_type]) {
         $view->addProperty(
@@ -505,6 +537,12 @@ final class ManiphestTaskDetailController extends ManiphestController {
       }
     }
 
+    if ($revisions_commits) {
+      $view->addProperty(
+        pht('Commits'),
+        phutil_implode_html(phutil_tag('br'), $revisions_commits));
+    }
+
     $attached = $task->getAttached();
     $file_infos = idx($attached, PhabricatorPHIDConstants::PHID_TYPE_FILE);
     if ($file_infos) {

src/applications/phid/PhabricatorObjectHandle.php

@@ -166,8 +166,10 @@ final class PhabricatorObjectHandle {
   }
 
 
-  public function renderLink() {
+  public function renderLink($name = null) {
+    if ($name === null) {
       $name = $this->getLinkName();
+    }
     $class = null;
     $title = null;