If a buffer uses the default left fringe width, the variable
left-fringe-width is nil while the function window-fringes returns
information about the fringes of a window. So there appears to be
no way to determine the fringe width of a buffer that is not
currently displayed.
What does it mean to speak of the "fringe width of a buffer that is
not currently displayed"?
If it means the fringe width that would be in effect if that buffer is
displayed in a window, then if left-fringe-width is nil in that
buffer, it should use the default. So couldn't you just use the
default value?
That ought to be easy, so if you think this problem is hard, perhaps I
have missed the point.
Anyway, your changes in the Lisp Manual look good.
Please install them.
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