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Comment by onli
Martin refers to http://www.markshuttleworth.com/archives/1295, I think. He wrote about it in http://blog.martin-graesslin.com/blog/2013/10/thoughts-about.... It is about the Mir-Support of KWin/KDE (Martin is the current KWin developer) - while KDE doesn't want to support Mir right now, and says it is about technical reasons, Shuttleworth suggested it is a political thing, which Martin didn't like at all.
Seems like after his post there were some not so nice reactions. Though the comments on his blog seem to be nice enough, at first glance.