January 19th 2020
Compute the signed vertical pixel distance between the top of two lines
the standard custom layer context pointer
the id of the view who's layout will be measured
the line number of the line 'A' in the subtraction top(A) - top(B)
the line number of the line 'B' in the subtraction top(A) - top(B)
the signed distance between the lines in pixels on success, when the view exists and contains both given line numbers
Line numbers are 1 based.
Equivalent to calling the buffer related function of the same name by deriving the buffer, width, and face from the view.