Restore lightbox behavior for thumbnailed images

Summary: Ref T13099. See <https://discourse.phabricator-community.org/t/lightbox-not-working/1201>. The Content-Security-Policy changes rewrote some of this code and the handling for "Download" links is incorrectly catching clicks on thumbnailed images.

Test Plan: Clicked a thumbnailed image, got a lightbox. Command-clicked a download link, still got link behavior instead of a lightbox.

Maniphest Tasks: T13099

Differential Revision: https://secure.phabricator.com/D19188

resources/celerity/map.php

@@ -10,7 +10,7 @@ return array(
     'conpherence.pkg.css' => 'e68cf1fa',
     'conpherence.pkg.js' => '15191c65',
     'core.pkg.css' => '2fa91e14',
-    'core.pkg.js' => 'a3ceffdb',
+    'core.pkg.js' => 'e4d73c62',
     'darkconsole.pkg.js' => '1f9a31bc',
     'differential.pkg.css' => '113e692c',
     'differential.pkg.js' => 'f6d809c0',
@@ -494,7 +494,7 @@ return array(
     'rsrc/js/core/behavior-hovercard.js' => 'bcaccd64',
     'rsrc/js/core/behavior-keyboard-pager.js' => 'a8da01f0',
     'rsrc/js/core/behavior-keyboard-shortcuts.js' => '01fca1f0',
-    'rsrc/js/core/behavior-lightbox-attachments.js' => 'e31fad01',
+    'rsrc/js/core/behavior-lightbox-attachments.js' => '562bcce0',
     'rsrc/js/core/behavior-line-linker.js' => 'a9b946f8',
     'rsrc/js/core/behavior-more.js' => 'a80d0378',
     'rsrc/js/core/behavior-object-selector.js' => '77c1f0b0',
@@ -643,7 +643,7 @@ return array(
     'javelin-behavior-history-install' => '7ee2b591',
     'javelin-behavior-icon-composer' => '8499b6ab',
     'javelin-behavior-launch-icon-composer' => '48086888',
-    'javelin-behavior-lightbox-attachments' => 'e31fad01',
+    'javelin-behavior-lightbox-attachments' => '562bcce0',
     'javelin-behavior-line-chart' => 'e4232876',
     'javelin-behavior-load-blame' => '42126667',
     'javelin-behavior-maniphest-batch-selector' => 'ad54037e',
@@ -1362,6 +1362,15 @@ return array(
       'javelin-vector',
       'javelin-dom',
     ),
+    '562bcce0' => array(
+      'javelin-behavior',
+      'javelin-stratcom',
+      'javelin-dom',
+      'javelin-mask',
+      'javelin-util',
+      'phuix-icon-view',
+      'phabricator-busy',
+    ),
     '58dea2fa' => array(
       'javelin-install',
       'javelin-util',
@@ -2067,15 +2076,6 @@ return array(
       'javelin-dom',
       'phabricator-draggable-list',
     ),
-    'e31fad01' => array(
-      'javelin-behavior',
-      'javelin-stratcom',
-      'javelin-dom',
-      'javelin-mask',
-      'javelin-util',
-      'phuix-icon-view',
-      'phabricator-busy',
-    ),
     'e379b58e' => array(
       'javelin-behavior',
       'javelin-stratcom',

webroot/rsrc/js/core/behavior-lightbox-attachments.js

@@ -48,8 +48,9 @@ JX.behavior('lightbox-attachments', function() {
     }
 
     // If you click the "Download" link inside an embedded file element,
-    // don't lightbox the file.
+    // don't lightbox the file. But do lightbox when the user clicks an
-    if (e.getNode('tag:a')) {
+    // "<img />" inside an "<a />".
+    if (e.getNode('tag:a') && !e.getNode('tag:img')) {
       return;
     }