Fix pipe timing for copy test
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Hash: SHA1
Fix pipe timing for copy test
manifest hash: 75c389c84f4edacdd9163b6e5234f3ea334ca4b3
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+ hg init
+ echo This is file a1
+ hg add a
+ hg commit -t 'commit #0' -d '0 0' -u user
+ ls
a
+ echo This is file b1
+ hg add b
+ hg commit -t 'commit #1' -d '0 0' -u user
+ hg co 0
+ ls
a