Do need keep mail in thread when sending a new version patch?

[Du, ChangbinX]

Hi, developers!
	I have a question about sending patch: If my patch have a new version, 
do I need set "--in-reply-to" option so keep them in the same thread when
sending it? And in which cases should "--in-reply-to" option be set? Thanks!

Best Regards
Du, Changbin


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