I am using emacs ediff to compare two files that I frequently update. How can I refresh or update the buffer to reflect the new file without killing and reloading ediff? When I try to update each file using C-x C-v, the Ediff Control Panel says "You have killed a vital Ediff buffer--you must leave Ediff now!"
emacs ediff refresh buffers
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Try updating the file with M-x revert-buffer, and then hit ! in the Ediff control panel to make Ediff recalculate the difference regions.
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Ediff have ediff-revert-buffers-then-recompute-diffs.
From the ediff manual ediff-revert-buffers-then-recompute-diffs:
ediff-revert-buffers-then-recompute-diffs: This command reverts the buffers you are comparing and recomputes their differences. It is useful when, after making changes, you decided to make a fresh start, or if at some point you changed the files being compared but want to discard any changes to comparison buffers that were done since then.
Switch to the Emacs Ediff control panel and and press
!.That will do it.