render_tag -> tag: Differential Changeset stuff

Summary: I cheated in a couple of places here, but this is in the process of getting refactored anyway, and there's a pretty clear boundary.

Test Plan: Viewed changesets in Differential, viewed standalone. Viewed context elements.

Reviewers: vrana

Reviewed By: vrana

CC: aran

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4723

src/applications/differential/controller/DifferentialChangesetViewController.php

@@ -234,6 +234,10 @@ final class DifferentialChangesetViewController extends DifferentialController {
 
     Javelin::initBehavior('differential-comment-jump', array());
 
+    // TODO: [HTML] Clean up DifferentialChangesetParser output, but it's
+    // undergoing like six kinds of refactoring anyway.
+    $output = phutil_safe_html($output);
+
     $detail = new DifferentialChangesetDetailView();
     $detail->setChangeset($changeset);
     $detail->appendChild($output);