[issue16930] mention limitations and/or alternatives to hg graft

[Ezio Melotti]

Ezio Melotti added the comment:

Because if the graft succeeds "hg graft 2.7" does everything (including porting extra modifications that I made before committing on 2.7 and the commit on 3.2), if there are conflicts I just spend a few seconds more in kdiff3 to fix them.
Reapplying the patch means that I have to do import + commit at least, and possibly reapply manually changes that I've already done on 2.7.
(I'm assuming that the patch is applied on 2.7 and grafted on 3.2, but the opposite should also be valid.)

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<http://bugs.python.org/issue16930>
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