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git checkout: fix default head case
The "${new=$old}" syntax only works for an undefined 'new', not for an empty one. I knew that. Really. I'm not stupid.
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@ -29,7 +29,7 @@ while [ "$#" != "0" ]; do
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esac
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i=$(($i+1))
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done
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: ${new=$old}
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[ -z "$new" ] && new=$old
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if [ "$force" ]
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then
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