Doubled Conversation when clicking rapidly through dialog

[srmalloy]

It's a low-chance event, and doesn't affect anything but requiring extra clicks, but when you are 'talking' to an NPC, if you just click rapidly at a point in the dialog window to move the conversation along because you've seen it all so many times before -- for example, with Hua Tov in entry room of the third mission of Heather Townsend's arc -- you can confuse the server and get run through the dialog a second time.