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Improve previous change.
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@ -111,8 +111,9 @@ is currently defined.
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These functions define an abbrev in a specified abbrev table.
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@code{define-abbrev} is the low-level basic function, while
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@code{add-abbrev} is used by commands that ask for information from the
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user.
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@code{add-abbrev} is used by commands that ask for information from
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the user. When major modes predefine standard abbrevs, they should
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call @code{define-abbrev} and specify @code{t} for @var{system-flag}.
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@defun add-abbrev table type arg
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This function adds an abbreviation to abbrev table @var{table} based on
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@ -156,12 +157,14 @@ of the character. By contrast, if @var{hook} returns @code{nil},
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@code{expand-abbrev} also returns @code{nil}, as if expansion had not
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really occurred.
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If @var{system-flag} is non-@code{nil}, that marks the abbrev as a
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``system'' abbrev with the @code{system-type} property.
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Normally the function @code{define-abbrev} sets the variable
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@code{abbrevs-changed} to @code{t}. But if @var{system-flag} is
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non-@code{nil}, that says the abbrev is a ``system'' abbrev. In that
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case, @code{define-abbrev} does not alter @code{abbrevs-changed}.
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Instead it marks the abbrev as a ``system'' abbrev with the
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@code{system-type} property.
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@code{abbrevs-changed} to @code{t}, if it actually changes the abbrev.
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(This is so that some commands will offer to save the abbrevs.) It
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does not do this for a ``system'' abbrev, since those won't be saved
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anyway.
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@end defun
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@defopt only-global-abbrevs
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