Remove obsolete complexities in embedding code.

src/Linkification/Embedding.coffee

@@ -59,12 +59,10 @@ Embedding =
     $.after link, [$.tn(' '), embed]
 
     if Conf['Auto-embed'] and !Conf['Floating Embeds'] and !post.isFetchedQuote
-      autoEmbed = ->
-        if doc.contains(embed) and not $.hasClass(doc, 'catalog-mode')
-          $.off d, 'PostsInserted', autoEmbed
-          Embedding.cb.toggle.call embed
-      $.on d, 'PostsInserted', autoEmbed
-      autoEmbed()
+      if $.hasClass(doc, 'catalog-mode')
+        $.addClass embed, 'embed-removed'
+      else
+        Embedding.cb.toggle.call embed
 
   ready: ->
     return if !Main.isThisPageLegit()

src/css/style.css

@@ -2033,9 +2033,7 @@ a:only-of-type > .remove {
 }
 
 /* Embedding */
-.embedder:not(.embedded) > span,
-:root.catalog-mode .embedder > span,
-:root.catalog-mode .board .media-embed {
+.embedder:not(.embedded) > span {
   display: none;
 }
 #embedding {