Consolidate code to add/remove catalog classes from posts.

src/General/Build.coffee

@@ -175,8 +175,7 @@ Build =
       $.rmAll root
       if thread.nodes.placeholder
         thread.nodes.placeholder = null
-        $.rmClass thread.OP.nodes.root, 'catalog-postContainer'
-        $.rmClass thread.OP.nodes.post, 'catalog-post'
+        thread.OP.setCatalogOP false
     else
       thread.nodes.root = root = $.el 'div',
         className: 'thread'

src/General/Index.coffee

@@ -781,8 +781,7 @@ Index =
       if thread.nodes.placeholder
         $.replace thread.nodes.placeholder, thread.OP.nodes.root
         thread.nodes.placeholder = null
-        $.rmClass thread.OP.nodes.root, 'catalog-postContainer'
-        $.rmClass thread.OP.nodes.post, 'catalog-post'
+        thread.OP.setCatalogOP false
       if (file = thread.OP.file) and (thumb = thread.OP.file.thumb) and thumb.dataset.src
         thumb.src = thumb.dataset.src
         # XXX https://bugzilla.mozilla.org/show_bug.cgi?id=1021289
@@ -802,8 +801,7 @@ Index =
         thread.nodes.placeholder = $.el 'div'
         $.replace thread.OP.nodes.root, thread.nodes.placeholder
         $.add thread.catalogView.nodes.root, thread.OP.nodes.root
-        $.addClass thread.OP.nodes.root, 'catalog-postContainer'
-        $.addClass thread.OP.nodes.post, 'catalog-post'
+        thread.OP.setCatalogOP true
       nodes.push thread.catalogView.nodes.root
     $.add Index.root, nodes
     if doc.contains Index.root

src/classes/Post.Clone.coffee

@@ -29,11 +29,11 @@ Post.Clone = class extends Post
     $.rmClass @nodes.post, 'highlight' # keybind navigation, ID highlighting
 
     # Remove catalog stuff.
-    $.rmClass @nodes.root, 'catalog-postContainer'
-    $.rmClass @nodes.post, 'catalog-post'
-    $.rm $('.catalog-link', @nodes.post)
-    $.rm $('.catalog-stats', @nodes.post)
-    $.rm $('.catalog-replies', @nodes.post)
+    unless @isReply
+      @setCatalogOP false
+      $.rm $('.catalog-link', @nodes.post)
+      $.rm $('.catalog-stats', @nodes.post)
+      $.rm $('.catalog-replies', @nodes.post)
 
     @parseQuotes()
     @quotes = [@origin.quotes...]

src/classes/Post.coffee

@@ -258,3 +258,7 @@ class Post
     for clone in @clones[index..]
       clone.nodes.root.dataset.clone = index++
     return
+
+  setCatalogOP: (isCatalogOP) ->
+    @nodes.root.classList.toggle 'catalog-postContainer', isCatalogOP
+    @nodes.post.classList.toggle 'catalog-post',          isCatalogOP