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+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=678842
+-->
+<head>
+  <title>Test for Bug 678842</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=678842">Mozilla Bug 678842</a>
+<p id="display"></p>
+<iframe id="content"></iframe>
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 678842 **/
+SimpleTest.waitForExplicitFinish();
+var content = document.getElementById('content');
+// load a subframe containing an editor with a defined unknown lang. At first
+// load, it will set dictionary to en-US. At second load, it will return current
+// dictionary. So, we can check, dictionary is correctly remembered between
+// loads.
+
+var firstLoad = true;
+var script;
+
+var loadListener = function(evt) {
+  if (firstLoad) {
+    script = SpecialPowers.loadChromeScript(function() {
+      var dir = Components.classes["@mozilla.org/file/directory_service;1"]
+                          .getService(Components.interfaces.nsIProperties)
+                          .get("CurWorkD", Components.interfaces.nsIFile);
+      dir.append("tests");
+      dir.append("editor");
+      dir.append("composer");
+      dir.append("test");
+
+      var hunspell = Components.classes["@mozilla.org/spellchecker/engine;1"]
+                               .getService(Components.interfaces.mozISpellCheckingEngine);
+
+      // Install en-GB dictionary.
+      en_GB = dir.clone();
+      en_GB.append("en-GB");
+      hunspell.addDirectory(en_GB);
+
+      addMessageListener("en_GB-exists", () => en_GB.exists());
+      addMessageListener("destroy", () => hunspell.removeDirectory(en_GB));
+    });
+    is(script.sendSyncMessage("en_GB-exists")[0][0], true,
+       "true expected (en-GB directory should exist)");
+  }
+
+  var doc = evt.target.contentDocument;
+  var elem = doc.getElementById('textarea');
+  var editor = SpecialPowers.wrap(elem).QueryInterface(SpecialPowers.Ci.nsIDOMNSEditableElement).editor;
+  editor.setSpellcheckUserOverride(true);
+  var inlineSpellChecker = editor.getInlineSpellChecker(true);
+
+  SpecialPowers.Cu.import("resource://gre/modules/AsyncSpellCheckTestHelper.jsm")
+  .onSpellCheck(elem, function () {
+    var spellchecker = inlineSpellChecker.spellChecker;
+    try {
+      var currentDictonary = spellchecker.GetCurrentDictionary();
+    } catch(e) {}
+
+    if (!currentDictonary) {
+      spellchecker.SetCurrentDictionary('en-US');
+    }
+
+    if (firstLoad) {
+      firstLoad = false;
+
+       // First time around, the dictionary defaults to the locale.
+      is (currentDictonary, "en-US", "unexpected lang " + currentDictonary + " instead of en-US");
+
+      // Select en-GB.
+      spellchecker.SetCurrentDictionary("en-GB");
+
+      content.src = 'http://mochi.test:8888/tests/editor/composer/test/bug678842_subframe.html?firstload=false';
+    } else {
+      is (currentDictonary, "en-GB", "unexpected lang " + currentDictonary + " instead of en-GB");
+      content.removeEventListener('load', loadListener, false);
+
+      // Remove the fake en-GB dictionary again, since it's otherwise picked up by later tests.
+      script.sendSyncMessage("destroy");
+
+      // This will clear the content preferences and reset "spellchecker.dictionary".
+      spellchecker.SetCurrentDictionary("");
+      SimpleTest.finish();
+    }
+  });
+}
+
+content.addEventListener('load', loadListener, false);
+
+content.src = 'http://mochi.test:8888/tests/editor/composer/test/bug678842_subframe.html?firstload=true';
+
+</script>
+</pre>
+</body>
+</html>