It's compared to windw_height(window) and should thus be expressed in number
of lines, but its default value of 500 is then basically equivalent to
most-positive-fixnum. I.e. "never split". Was that really the intention?
I think so. This large value means, in effect, "Don't split a window
unless it is the whole frame."
However, it is ugly and not 100% reliable to use 500 to mean that.
In theory, someone might have a frame more than 500 lines tall. It
would be cleaner to use the largest positive fixnum, or perhaps define
nil to have this meaning and use nil.
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