Issue 5817 - Retry sending suggested filters to block element dialog

composer.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 78 matching lines @@
   $("button").button();
 
   document.getElementById("filters").focus();
 
   ext.onMessage.addListener((msg, sender, sendResponse) =>
   {
     switch (msg.type)
     {
       case "composer.dialog.init":
         targetPageId = msg.sender;
-        document.getElementById("filters").value = msg.filters.join("\n");
+        let filtersTextArea = document.getElementById("filters");
+        filtersTextArea.value = msg.filters.join("\n");
+        filtersTextArea.disabled = false;
         break;
       case "composer.dialog.close":
         closeMe();
         break;
     }
   });
 
   window.removeEventListener("load", init);
 }
 window.addEventListener("load", init, false);