Document history-length.
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@ -435,6 +435,20 @@ needs to do to use a history list is to initialize it and to pass its
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name to the input functions when you wish. But it is safe to modify the
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list by hand when the minibuffer input functions are not using it.
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Emacs functions that add a new element to a history list can also
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delete old elements if the list gets too long. The variable
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@code{history-length} specifies the maximum length for most history
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lists. To specify a different maximum length for a particular history
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list, put the length in the @code{history-length} property of the
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history list symbol.
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@defvar history-length
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The value of this variable specifies the maximum length for all
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history lists that don't specify their own maximum lengths. If the
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value is @code{t}, that means there no maximum (don't delete old
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elements).
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@end defvar
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Here are some of the standard minibuffer history list variables:
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@defvar minibuffer-history
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