MDL-35771 patch tinymce to use lower zindexes

The reason is that YUI does not like that bing zIndexes when dragging panels. We should probably try to find the reason why YUI dragging fails and report it upstream.

lib/editor/tinymce/lib.php

@@ -27,7 +27,7 @@ defined('MOODLE_INTERNAL') || die();
 
 class tinymce_texteditor extends texteditor {
     /** @var string active version - this is the directory name where to find tinymce code */
-    public $version = '3.5.7';
+    public $version = '3.5.7b';
 
     /**
      * Is the current browser supported by this editor?

lib/editor/tinymce/readme_moodle.txt

@@ -14,7 +14,13 @@ Upgrade procedure:
 3/ bump up main version.php
 4/ update lib/thirdpartylibs.xml
 5/ execute cli/update_lang_files.php and review changes in lang/en/editor_tinymce.php
+6/ use search to find oversized zIndexes and divide them by 100
 
 
+Changes:
+
+1/ zIndex 300000 and 200000 changed to 3000 and 2000 - this prevents collision with YUI,
+   see MDL-35771
+
 TODO:
  * create some new automated script that sends other languages from upstream into AMOS

lib/editor/tinymce/tiny_mce/3.5.7b/plugins/inlinepopups/editor_plugin_src.js

@@ -36,7 +36,7 @@
 			var t = this;
 
 			t.parent(ed);
-			t.zIndex = 300000;
+			t.zIndex = 3000;
 			t.count = 0;
 			t.windows = {};
 		},