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   4  <title>Option: custom_undo_redo_levels</title>
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  10      <h1>Option: custom_undo_redo_levels</h1>
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  14      <p>
  15          This option should contain the number of undo levels to keep in memory. This is set to -1 by default and such a value tells TinyMCE to use a unlimited number of undo levels. But this steals lots of memory so for low end systems a value of 10 may be better.
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  19  
  20      <h3>Example of usage of the custom_undo_redo_levels option:</h3>
  21      <div class="example">
  22  <pre>
  23  tinyMCE.init({
  24      ...
  25      <strong>custom_undo_redo_levels : 10</strong>
  26  });
  27  </pre>
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