revert: apply normallookup on reverted file if size isn't changed (issue4583) Before this patch, reverting a file to the revision other than the parent doesn't update dirstate. This seems to expect that timestamp and/or size will be changed by reverting. But if (1) dirstate of file "f" is filled with timestamp before reverting and (2) size and timestamp of file "f" isn't changed at reverting, file "f" is recognized as CLEAN unexpectedly. This patch applies "dirstate.normallookup()" on reverted file, if size isn't changed. Making "localrepository.wwrite()" return length of written data is needed to avoid additional (and redundant) "lstat(2)" on the reverted file. "filectx.size()" can't be used to know it, because data may be decoded at being written out. BTW, interactive reverting may cause similar problem, too. But this patch doesn't focus on fixing it, because (1) interactive (maybe slow) reverting changes one (or both) of size/timestamp of reverted files in many usecases, and (2) changes to fix it seems not suitable for stable branch.

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