Add a Delete link to Differential inline comment previews

Summary:
This lets you delete inlines from the preview at the bottom of
the page, instead of hunting for them through the diffs.

There is not yet a keyboard shortcut.

The mechanism for updating the inlines in the diffs is kind of a hack
and I'm sure I'm special-casing way too much, but at least it works.

Test Plan:
Load revision with many diffs. Create inlines all over the
place. Delete them all. Mwahaha.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1433, T1431

Differential Revision: https://secure.phabricator.com/D3131

src/applications/differential/view/DifferentialInlineCommentView.php

@@ -90,6 +90,9 @@ final class DifferentialInlineCommentView extends AphrontView {
     );
 
     $sigil = 'differential-inline-comment';
+    if ($this->preview) {
+      $sigil = $sigil . ' differential-inline-comment-preview';
+    }
 
     $content = $inline->getContent();
     $handles = $this->handles;
@@ -177,6 +180,14 @@ final class DifferentialInlineCommentView extends AphrontView {
           'sigil'       => 'differential-inline-preview-jump',
         ),
         'Not Visible');
+      $links[] = javelin_render_tag(
+        'a',
+        array(
+          'href'        => '#',
+          'mustcapture' => true,
+          'sigil'       => 'differential-inline-delete',
+        ),
+        'Delete');
     }
 
     if ($links) {