Re: Tab bar

[Richard Stallman]

    Users who want to use tabs will probably use them instead of frames (in 
    my experience, there is little overlap between users who want everything 
    in one frame with tabs to select between them, and users who want a 
    separate frame for everything), so sharing keybindings with C-x 5 may be 
    an acceptable solution if we cannot find free keys.

That sounds plausible to me.

                                                        Something like: if 
    the current window or its containing frame is already tabbed, or if the 
    user or mode has expressed a preference for a tabbed UI, then C-x 5 C-f 
    creates a new tab, and C-u C-x 5 C-f creates a new frame. Otherwise the 
    behaviour of C-x 5 bindings are reversed.

This convention might be problematical, especially if some of the commands
already use the prefix arg for something else.