Revert "New API for replacing elements in the final JsonML. Also changes spoiler"

This reverts commit 6b9b2d3d6a.

We have come up with a better solution that does not involve HTML
parsing.

app/assets/javascripts/discourse/dialects/bbcode_dialect.js

@@ -78,23 +78,16 @@ Discourse.Dialect.inlineBetween({
   emitter: function(contents) { return ['a', {href: contents, 'data-bbcode': true}, contents]; }
 });
 
-
 Discourse.Dialect.inlineBetween({
   start: '[spoiler]',
   stop: '[/spoiler]',
   rawContents: true,
   emitter: function(contents) {
-    return ["__spoiler", this.processInline(contents)];
-  }
-});
-
-Discourse.Dialect.replaceElement('__spoiler', function(node, processInside) {
-  // Surround images with a `<div class='spoiler'>`, any other tags
-  // end up in a `span`
-  if (node.nodeType === 1 && node.nodeName === "IMG") {
-    return ['div', {class: 'spoiler'}, processInside(node)];
-  } else {
-    return ['span', {class: 'spoiler'}, processInside(node)];
+    if (/<img/i.test(contents)) {
+      return ['div', { 'class': 'spoiler' }, contents];
+    } else {
+      return ['span', { 'class': 'spoiler' }, contents];
+    }
   }
 });