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Make buffer BUFFER-OR-NAME current for editing operations.
may be a buffer or the name of an existing buffer.
When an editing command returns to the editor command loop, Emacs automatically
calls set-buffer on the buffer shown in the selected window. you should not
use set-buffer to switch visibly to a different buffer; for that, use the
functions described in Switching Buffers. However, when writing a Lisp
function, do not rely on this behavior of the command loop to restore the
current buffer after an operation.
To operate temporarily on another buffer, put the set-buffer within a
save-current-buffer form.