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<a name="reordering-in-levels-0-and-1"></a>Reordering in levels 0 and 1</h2></div></div></div>
<p>
      Another common operation in the more complex shapers is glyph
      reordering. In order to maintain a monotonic cluster sequence
      when glyph reordering takes place, HarfBuzz merges the clusters
      of everything in the reordering sequence.
    </p>
<p>
      For example, let us again start with the character sequence (top
      row) and initial cluster values (bottom row):
    </p>
<pre class="programlisting">
      A,B,C,D,E
      0,1,2,3,4
    </pre>
<p>
      If <code class="literal">D</code> is reordered to the position immediately
      before <code class="literal">B</code>, then HarfBuzz merges the
      <code class="literal">B</code>, <code class="literal">C</code>, and
      <code class="literal">D</code> clusters — all the clusters between
      the final position of the reordered glyph and its original
      position. This means that we get:
    </p>
<pre class="programlisting">
      A,D,B,C,E
      0,1,1,1,4
    </pre>
<p>
      as the final cluster sequence.
    </p>
<p>
      Merging this many clusters is not ideal, but it is the only
      sensible way for HarfBuzz to maintain the guarantee that the
      sequence of cluster values remains monotonic and to retain the
      true relationship between glyphs and characters.
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