fix handling of files of unsupported type in the walk code if a file was of unsupported type, it was considered as 'seen' while walking. this way it was possible to have file in the dirstate not yielded by the walk function.

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#!/bin/sh

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hg init

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echo 123 > a

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hg add a

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hg commit -m "first" -d "0 0" a

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mkdir sub

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echo 321 > sub/b

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hg add sub/b

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hg commit -m "second" -d "0 0" sub/b

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cat sub/b

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hg co 0

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cat sub/b

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ls sub

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true