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 a

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cd a

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echo a > foo

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hg add foo

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hg commit -m 1 -d "0 0"

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rm foo

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hg remove foo

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hg commit -m 2 -d "0 0"

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cd ..

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hg clone a b