catalog: use copy of comment HTML from before running features like Linkify/Embed

src/General/Build.coffee

@@ -353,7 +353,7 @@ Build =
         '<span class="thread-icons"></span>' +
       '</div>' +
       '&{subject}' +
-      '<div class="comment">&{thread.OP.nodes.comment}</div>'
+      '<div class="comment">&{thread.OP.info.commentHTML}</div>'
     ) %>
 
     root.dataset.fullID = thread.fullID

src/General/lib/post.class

@@ -86,6 +86,7 @@ class Post
   parseComment: ->
     # Merge text nodes and remove empty ones.
     @nodes.comment.normalize()
+
     # Get the comment's text.
     # <br> -> \n
     # Remove:
@@ -98,7 +99,11 @@ class Post
     for node in $$ '.abbr, .exif, b', bq
       $.rm node
     @info.comment = @nodesToText bq
-    # Hide spoilers.
+
+    # Save cleaned comment HTML.
+    @info.commentHTML = <%= html('&{bq}') %>
+
+    # Get the comment's text with spoilers hidden.
     spoilers = $$ 's', bq
     @info.commentSpoilered = if spoilers.length
       for node in spoilers