Differential - make sure not to return change type header if we're not top level

Summary: Followup to D6924. Fixes T3824.

Test Plan: deleted a file in a diff. was able to view file content without JS errors

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Maniphest Tasks: T3824

Differential Revision: https://secure.phabricator.com/D6963

src/applications/differential/parser/DifferentialChangesetParser.php

@@ -665,8 +665,7 @@ final class DifferentialChangesetParser {
     if ($changeset->getChangeType() == DifferentialChangeType::TYPE_DELETE &&
         $old == array('unix:filemode' => '100644')) {
       return false;
-     }
+    }
-
     return true;
   }
 
@@ -691,6 +690,7 @@ final class DifferentialChangesetParser {
     $renderer = $this->getRenderer()
       ->setChangeset($this->changeset)
       ->setRenderPropertyChangeHeader($render_pch)
+      ->setIsTopLevel($this->isTopLevel)
       ->setOldRender($this->oldRender)
       ->setNewRender($this->newRender)
       ->setHunkStartLines($this->hunkStartLines)

src/applications/differential/render/DifferentialChangesetRenderer.php

@@ -6,6 +6,7 @@ abstract class DifferentialChangesetRenderer {
   private $changeset;
   private $renderingReference;
   private $renderPropertyChangeHeader;
+  private $isTopLevel;
   private $hunkStartLines;
   private $oldLines;
   private $newLines;
@@ -236,14 +237,25 @@ abstract class DifferentialChangesetRenderer {
     return $this->renderPropertyChangeHeader;
   }
 
+  public function setIsTopLevel($is) {
+    $this->isTopLevel = $is;
+    return $this;
+  }
+  private function getIsTopLevel() {
+    return $this->isTopLevel;
+  }
+
   final public function renderChangesetTable($content) {
     $props = null;
     if ($this->shouldRenderPropertyChangeHeader()) {
       $props = $this->renderPropertyChangeHeader();
     }
 
-    $force = (!$content && !$props);
+    $notice = null;
-    $notice = $this->renderChangeTypeHeader($force);
+    if ($this->getIsTopLevel()) {
+      $force = (!$content && !$props);
+      $notice = $this->renderChangeTypeHeader($force);
+    }
 
     $result = $notice.$props.$content;