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Correctly compute the effective margin beyond the edge of the window #21

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Correctly compute the effective margin beyond the edge of the window #21

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14 changes: 13 additions & 1 deletion smooth-scrolling.el
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Original file line number Diff line number Diff line change
Expand Up @@ -184,7 +184,7 @@ the logical line."
#'beginning-of-line))
(point)))

(defun smooth-scroll-count-lines (start end)
(defun smooth-scroll-count-lines-positive (start end)
"Return number of (logical/visual) lines between START and END.

If `smooth-scroll-strict-margins' is non-nil, this counts visual
Expand All @@ -199,6 +199,18 @@ to pass them in order."
#'count-lines)
start end)))

(defun smooth-scroll-count-lines (start end)
"Return number of (logical/visual) lines between START and END.

If `smooth-scroll-strict-margins' is non-nil, this counts visual
lines. Otherwise it counts logical lines.

If END is less than START, this can return a negative number."
(if (< end start)
(- (smooth-scroll-count-lines-positive end start))
(smooth-scroll-count-lines-positive start end)
))

(defun smooth-scroll-lines-above-point ()
"Return the number of lines in window above point.

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