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At the moment a shared region of code gets locked only when user starts to type the first character - and becoz the locking process takes a few seconds (I'm not sure if that breaks the UI responsiveness criteria already) it is often frustrating the find that subsequent typings get ignored. Not sure if it is related, but Ctrl+C / V does not work immediately as well, which is kinda annoying.
Reassigning to issues@collab. Collab Support plugin is not actively maintained. Obsoleted in 6.7 by the newly introduced integration with Project Kenai, a collaborative environment for developers to host their open-source projects, which includes also a chat service.