with chat bubbles active the client shows "typing" in the nametag while someone is typing text. It does not vanish again when they press enter though and stays visible as long as the said text is visible in the chat bubble.
CPU: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (3400 MHz)
Memory: 24576 MB
OS Version: Mac OS X 10.8.4 Darwin 12.4.0 Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64
Graphics Card Vendor: ATI Technologies Inc.
Graphics Card: ATI Radeon HD 6970M OpenGL Engine