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(gnus)Mode Line Formatting

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Mode Line Formatting
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   Mode line formatting variables (e.g.,
`gnus-summary-mode-line-format') follow the same rules as other, buffer
line oriented formatting variables (Note: Formatting Basics) with the
following two differences:

  1. There must be no newline (`\n') at the end.

  2. The special `%%b' spec can be used to display the buffer name.
     Well, it's no spec at all, really--`%%' is just a way to quote `%'
     to allow it to pass through the formatting machinery unmangled, so
     that Emacs receives `%b', which is something the Emacs mode line
     display interprets to mean "show the buffer name".  For a full
     list of mode line specs Emacs understands, see the documentation
     of the `mode-line-format' variable.