Issue 1950 - Fixed: Filter tooltip not shown for long filters

chrome/content/ui/filters-filteractions.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 321 matching lines @@
     {
       event.preventDefault();
       return;
     }
 
     function setMultilineContent(box, text)
     {
       while (box.firstChild)
         box.removeChild(box.firstChild);
 
-      for (var i = 0; i < text.length; i += 80)
+      let lines = text.match(/.{1,80}/g);
+      if (lines.length > 7)
       {
-        var description = document.createElement("description");
-        description.setAttribute("value", text.substr(i, 80));
+        // Text is too long to display in full so we cut out the middle part
+        lines = lines.slice(0,3).concat("\u2026", lines.slice(-3));
+      }
+
+      for (let line of lines)
+      {
+        let description = document.createElement("description");
+        description.setAttribute("value", line);
         box.appendChild(description);
       }
     }
 
     setMultilineContent(E("tooltip-filter"), item.filter.text);
 
     E("tooltip-hitcount-row").hidden = !(item.filter instanceof ActiveFilter);
     E("tooltip-lasthit-row").hidden = !(item.filter instanceof ActiveFilter) || !item.filter.lastHit;
     if (item.filter instanceof ActiveFilter)
     {
@@ skipping 192 matching lines @@
       return;
 
     this.deleteItems(this.dragItems);
   }
 };
 
 window.addEventListener("load", function()
 {
   FilterActions.init();
 }, false);