com/templates/repo/editor/diff_preview.tmpl

<div class="diff-file-box">
	<div class="ui attached table segment">
		<div class="file-body file-code code-view code-diff">
			<table>
				<tbody>
					{{template "repo/diff/section_unified" dict "file" .File "root" $}}
				</tbody>
			</table>
		</div>
	</div>
</div>