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diff --git a/resources/sql/autopatches/20170528.maniphestdupes.php b/resources/sql/autopatches/20170528.maniphestdupes.php
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20170528.maniphestdupes.php
@@ -0,0 +1,68 @@
+<?php
+
+$table = new ManiphestTransaction();
+$add_edges = array();
+
+foreach (new LiskMigrationIterator($table) as $txn) {
+ $txn_type = $txn->getTransactionType();
+
+ if ($txn_type == 'mergedinto') {
+ // dupe handling as implemented in D10427, which creates a specific txn
+ $add_edges[] = array(
+ 'src' => $txn->getObjectPHID(),
+ 'dst' => $txn->getNewValue(),
+ );
+ } else if ($txn_type == 'status' && $txn->getNewValue() == 'duplicate') {
+ // dupe handling as originally implemented, which just changes the status
+ // and adds a comment
+ $src_phid = $txn->getObjectPHID();
+
+ // get all the comment transactions associated with this task
+ $viewer = PhabricatorUser::getOmnipotentUser();
+ $comment_txns = id(new ManiphestTransactionQuery())
+ ->setViewer($viewer)
+ ->withObjectPHIDs(array($src_phid))
+ ->needComments(true)
+ ->execute();
+
+ // check each comment, looking for the "Merged Into" message
+ foreach ($comment_txns as $comment_txn) {
+ if ($comment_txn->hasComment()) {
+ $comment = $comment_txn->getComment()->getContent();
+ $pattern = '/^\xE2\x9C\x98 Merged into T(\d+)\.$/';
+ $matches = array();
+
+ if (preg_match($pattern, $comment, $matches)) {
+ $dst_task = id(new ManiphestTaskQuery())
+ ->setViewer($viewer)
+ ->withIDs(array($matches[1]))
+ ->executeOne();
+
+ if ($dst_task) {
+ $dst_phid = $dst_task->getPHID();
+ $add_edges[] = array(
+ 'src' => $src_phid,
+ 'dst' => $dst_phid,
+ );
+ }
+ }
+ }
+ }
+ }
+}
+
+if ($add_edges) {
+ foreach ($add_edges as $edge) {
+ $src_phid = $edge['src'];
+ $dst_phid = $edge['dst'];
+
+ $type = ManiphestTaskIsDuplicateOfTaskEdgeType::EDGECONST;
+ try {
+ $editor = id(new PhabricatorEdgeEditor())
+ ->addEdge($src_phid, $type, $dst_phid)
+ ->save();
+ } catch (PhabricatorEdgeCycleException $ex) {
+ // Some earlier or later merge made this invalid, just skip it.
+ }
+ }
+}
diff --git a/src/applications/maniphest/controller/ManiphestTaskDetailController.php b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
--- a/src/applications/maniphest/controller/ManiphestTaskDetailController.php
+++ b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
@@ -36,6 +36,7 @@
ManiphestTaskHasMockEdgeType::EDGECONST,
PhabricatorObjectMentionedByObjectEdgeType::EDGECONST,
PhabricatorObjectMentionsObjectEdgeType::EDGECONST,
+ ManiphestTaskHasDuplicateTaskEdgeType::EDGECONST,
);
$phid = $task->getPHID();
@@ -159,6 +160,7 @@
$related_tabs[] = $this->newMocksTab($task, $query);
$related_tabs[] = $this->newMentionsTab($task, $query);
+ $related_tabs[] = $this->newDuplicatesTab($task, $query);
$tab_view = null;
@@ -553,6 +555,32 @@
->appendChild($view);
}
+ private function newDuplicatesTab(
+ ManiphestTask $task,
+ PhabricatorEdgeQuery $edge_query) {
+
+ $in_type = ManiphestTaskHasDuplicateTaskEdgeType::EDGECONST;
+ $in_phids = $edge_query->getDestinationPHIDs(array(), array($in_type));
+
+ $viewer = $this->getViewer();
+ $in_handles = $viewer->loadHandles($in_phids);
+ $in_handles = $this->getCompleteHandles($in_handles);
+
+ $view = new PHUIPropertyListView();
+
+ if (!count($in_handles)) {
+ return null;
+ }
+
+ $view->addProperty(
+ pht('Duplicates Merged Here'), $in_handles->renderList());
+
+ return id(new PHUITabView())
+ ->setName(pht('Duplicates'))
+ ->setKey('duplicates')
+ ->appendChild($view);
+ }
+
private function getCompleteHandles(PhabricatorHandleList $handles) {
$phids = array();

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