Thu, 23 Mar 2017 21:17:08 +0900 Yuya Nishihara similar: do not look up and create filectx more than once
Thu, 23 Mar 2017 21:10:45 +0900 Yuya Nishihara similar: use common names for changectx variables
Thu, 23 Mar 2017 20:50:33 +0900 Yuya Nishihara similar: get rid of quadratic addedfiles.remove()
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