This isn't a bug as far as I know, but the "+" added to the tab/window title of the chat when someone joins or leaves doesn't really differentiate between the two. I suggest that a "-" should be used for leaving users rather than a "+", as this would make it easier to determine whether or not someone has joined or left without having to turn on desktop notifications.
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Change 309773 had a related patch set uploaded (by Jack Phoenix):
Display a "-" rather than a " " in the tab/window title when users leave the chat
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Change 309773 merged by jenkins-bot:
Display a "-" rather than a " " in the tab/window title when users leave the chat
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It seems like all that has happened is that - has replaced +, as when a user joins/leaves, - is displayed regardless.