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Delete "new in Emacs 21" note.
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@ -861,7 +861,7 @@ or shorter, higher or lower, wider or narrower, or replaced with an image.
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If an overlay has a @code{help-echo} property, then when you move the
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mouse onto the text in the overlay, Emacs displays a help string in the
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echo area, or in the tooltip window. For details see @ref{Text
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help-echo}. This feature is available starting in Emacs 21.
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help-echo}.
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@item modification-hooks
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@kindex modification-hooks @r{(overlay property)}
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@ -2739,8 +2739,7 @@ a string, it is evaluated to obtain a help string.
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You can alter the way help text is displayed by setting the variable
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@code{show-help-function} (@pxref{Help display}).
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This feature is used in the mode line and for other active text. It is
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available starting in Emacs 21.
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This feature is used in the mode line and for other active text.
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@item keymap
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@cindex keymap of character
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