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 a > a

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hg add a

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hg commit -m "test" -d "0 0"

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hg history

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hg tag -d "0 0" "bleah"

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hg history

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echo foo >> .hgtags

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hg tag -d "0 0" "bleah2" || echo "failed"

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