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(Textual Scrolling): Doc 3 values for scroll-preserve-screen-position.
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@ -1523,9 +1523,12 @@ does not work with @code{scroll-margin}. The default value is zero.
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@end defopt
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@defopt scroll-preserve-screen-position
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If this option is non-@code{nil}, the scroll functions move point so
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that the vertical position of the cursor is unchanged, when that is
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possible.
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If this option is @code{t}, scrolling which would move the current
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point position out of the window chooses the new position of point
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so that the vertical position of the cursor is unchanged, if possible.
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If it is non-@code{nil} and not @code{t}, then the scrolling functions
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always preserve the vertical position of point, if possible.
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@end defopt
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@defopt next-screen-context-lines
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