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Like other complex-looking expressions, the conditional expression
beginning-of-buffer can be disentangled by looking at it
as parts of a template, in this case, the template for an if-then-else
expression. In skeletal form, the expression looks like this:
(if (buffer-is-large divide-buffer-size-by-10-and-multiply-by-arg else-use-alternate-calculation
The true-or-false-test of this inner
if expression checks the
size of the buffer. The reason for this is that the old Version 18
Emacs used numbers that are no bigger than eight million or so
and in the computation that followed, the programmer feared that Emacs
might try to use over-large numbers if the buffer were large. The
term `overflow', mentioned in the comment, means numbers that are over
large. Version 21 Emacs uses larger numbers, but this code has not
been touched, if only because people now look at buffers that are far,
far larger than ever before.
There are two cases: if the buffer is large and if it is not.
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