I was chatting earlier and noticed dotted lines in between chat messages:
What do they do?
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2meta.stackexchange.com/questions/109251/… – balpha Mar 23 '12 at 21:03
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@balpha Thanks!! – daviesgeek Mar 24 '12 at 20:19
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They appear when that chatroom screen has lost focus at the last message you read before going to another program or chatroom. When you come back, the line shows you where you left off reading so you don't have to figure out what was said while you were doing something else.