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7.11 Customizing the Mode Line

When Ediff is running, the mode line of ‘Ediff Control Panel’ buffer shows the current difference number and the total number of difference regions in the two files.

The mode line of the buffers being compared displays the type of the buffer (‘A:’, ‘B:’, or ‘C:’) and (usually) the file name. Ediff tries to be intelligent in choosing the mode line buffer identification. In particular, it works well with the uniquify.el and mode-line.el packages (which improve on the default way in which Emacs displays buffer identification). If you don't like the way Ediff changes the mode line, you can use ediff-prepare-buffer-hook to modify the mode line.