Issue 7450 - Implement hide-if-contains-visible-text snippet

test/browser/snippets.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 332 matching lines @@
   element = document.getElementById("article");
   expectVisible(test, element, "article");
   element = document.getElementById("article2");
   expectVisible(test, element, "article2");
 
   await runSnippet(
     test, "hide-if-contains-visible-text", "Spon", "#parent > article", "#parent > article a"
   );
 
   element = document.getElementById("article");
-  expectHidden(test, element, "article");

[hub, 2019/04/29 18:24:26]

Actually this should be `expectVisible` since the parent element is `display:
none`. But the code is incorrect and doesn't check that far up.

[hub, 2019/04/30 16:08:33]

This is now fixed in current patch.

+  expectVisible(test, element, "article");
   element = document.getElementById("article2");
   expectHidden(test, element, "article2");
   element = document.getElementById("article3");
   expectVisible(test, element, "article3");
 
   test.done();
 };