mq: reset self.added after the mq transaction instead of inside qimport
It seems wiser to reset mq.added at the end of the mq transaction instead of at
the beginning of a qimport call: this way, calling several times qimport()
without saving mq state in-between does not overwrite the previous value of
mq.added (this happens, for example in rebase, where we import several patches
in a batch before calling .save_dirty() )
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