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<title>Reordering in levels 0 and 1: HarfBuzz Manual</title>
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Reordering in levels 0 and 1
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Another common operation in the more complex shapers is when things
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reorder. In those cases, to maintain monotone clusters, HB merges
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the clusters of everything in the reordering sequence. For example,
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let's again start with the character sequence:
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A,B,C,D,E
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0,1,2,3,4
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If D is reordered before B,
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then the B, C, and
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D clusters merge, and we get:
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A,D,B,C,E
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0,1,1,1,4
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This is clearly not ideal, but it is the only sensible way to
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maintain monotone indices and retain the true relationship between
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glyphs and characters.
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