This file is indexed.

/usr/share/doc/tktreectrl/README.txt is in tktreectrl 2.2.8-1.

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Current maintainer: Tim Baker (treectrl@users.sourceforge.net)
Website: http://tktreectrl.sourceforge.net/

An extra help document with examples and pictures is available from
the main website:
http://tktreectrl.sourceforge.net/Understanding%20TkTreeCtrl.html