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(Vertical Scrolling): Document what does nil mean as the first arg of
set-window-vscroll.
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@ -1490,6 +1490,8 @@ This function sets @var{window}'s vertical scroll position to
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@var{lines}. The argument @var{lines} should be zero or positive; if
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not, it is taken as zero.
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If @var{window} is @code{nil}, the selected window is used.
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The actual vertical scroll position must always correspond
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to an integral number of pixels, so the value you specify
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is rounded accordingly.
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