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diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -208,6 +208,38 @@
case PhabricatorTransactions::TYPE_CUSTOMFIELD:
$field = $this->getCustomFieldForTransaction($object, $xaction);
return $field->getApplicationTransactionHasEffect($xaction);
+ case PhabricatorTransactions::TYPE_EDGE:
+ // A straight value comparison here doesn't always get the right
+ // result, because newly added edges aren't fully populated. Instead,
+ // compare the changes in a more granular way.
+ $old = $xaction->getOldValue();
+ $new = $xaction->getNewValue();
+
+ $old_dst = array_keys($old);
+ $new_dst = array_keys($new);
+
+ // NOTE: For now, we don't consider edge reordering to be a change.
+ // We have very few order-dependent edges and effectively no order
+ // oriented UI. This might change in the future.
+ sort($old_dst);
+ sort($new_dst);
+
+ if ($old_dst !== $new_dst) {
+ // We've added or removed edges, so this transaction definitely
+ // has an effect.
+ return true;
+ }
+
+ // We haven't added or removed edges, but we might have changed
+ // edge data.
+ foreach ($old as $key => $old_value) {
+ $new_value = $new[$key];
+ if ($old_value['data'] !== $new_value['data']) {
+ return true;
+ }
+ }
+
+ return false;
}
return ($xaction->getOldValue() !== $xaction->getNewValue());
@@ -1011,7 +1043,7 @@
}
if (!isset($edge['data'])) {
- $edge['data'] = null;
+ $edge['data'] = array();
}
return $edge;

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