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Use color-coding to compare two buffers.
The visual-diff command is like the diff command but uses
colors to show differences. It compares the current buffer with the
one shown in the next window on the screen, and constructs a new
buffer that contains all the lines of the two buffers. Lines from the
first buffer that don't appear in the second are displayed with a red
background. Lines in the second buffer that don't appear in the first
have a yellow background. Lines that are the same in both buffers are
colored normally, as are those parts of an added or removed line that
are the same in both buffers. With a numeric argument, the command
prompts for the name of a buffer to hold the results, instead of using
a buffer named
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