(chore) remove HTML auto-merging

Related highlightjs#2889.

Author: joshgoebel

VERSION_11_UPGRADE.md

@@ -2,6 +2,10 @@
 
 -  remove apache, http, nginx, properties, coffeescript from :common #2848
 
+### Feature Removal
+
+- HTML merging is now no longer included in core.  You'll want to use a plugin instead. https://github.com/highlightjs/highlight.js/issues/2889
+- fixMarkup is gone now, provide your own replacement #2534
 
 ### Behavior changes
 
@@ -26,7 +30,6 @@
 ## API's changed
 
 - rename second_best to secondBest (highlightAuto)
-- fixMarkup is gone now, provide your own replacement #2534
 - highlightElement/highlightBlock result now no longer returns `re` key, use `relevance` instead
 - `CSS_NUMBER_MODE` has now been moved into the internal `css-shared` library
 

src/highlight.js

@@ -13,7 +13,6 @@ import * as MODES from './lib/modes.js';
 import { compileLanguage } from './lib/mode_compiler.js';
 import * as packageJSON from '../package.json';
 import { BuildVuePlugin } from "./plugins/vue.js";
-import { mergeHTMLPlugin } from "./plugins/merge_html.js";
 import * as logger from "./lib/logger.js";
 
 const escape = utils.escapeHTML;
@@ -918,8 +917,6 @@ const HLJS = function(hljs) {
   // merge all the modes/regexs into our main object
   Object.assign(hljs, MODES);
 
-  // built-in plugins, likely to be moved out of core in the future
-  hljs.addPlugin(mergeHTMLPlugin);
   return hljs;
 };
 

src/plugins/merge_html.js

@@ -31,20 +31,6 @@
 
 </div>
 
-<div id="custom-markup">
-
-<!-- custom markup -->
-<pre><code class="html">&lt;<a href="http://dev.w3.org/html5/spec/Overview.html#the-div-element">div</a> id="contents"&gt;
-  <del>&lt;p&gt;Hello, World!</del><!-- A comment should not break merging --><ins>Goodbye, cruel world!</ins>
-&lt;/div&gt;
-</code></pre>
-
-<!-- <br> inside of <pre>s -->
-<pre><code class="language-javascript">&gt;&gt; '\x41\x42\x43'<br>'ABC'<br><hr><br>&gt;&gt; '\x61\x62\x63'<br>'abc'
-</code></pre>
-
-</div>
-
 <div id="language-alias">
 
 <!-- language alias -->

test/fixtures/expect/brInPre.txt

@@ -32,7 +32,6 @@ describe('special cases tests', () => {
   });
 
   require('./explicitLanguage');
-  require('./customMarkup');
   require('./languageAlias');
   require('./noHighlight');
   require('./subLanguages');