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A helper class for KCompletion. Implements a tree of QChar.
The tree looks like this (containing the items "kde", "kde-ui", "kde-core" and "pfeiffer". Every item is delimited with QChar( 0x0 )
some_root_node / \ k p | | d f | | e e /| | 0x0 - i / \ | u c f | | | i o f | | | 0x0 r e | | e r | | 0x0 0x0