bash_completion: support GNU sed 3 and non-GNU sed replaced command 'Q' introduced in GNU sed 4, in order to support platforms with older sed.

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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