split-height-threshold doc string is unclear

[Drew Adams]

The doc string says: "A window must be at least this tall to be eligible for
splitting by `display-buffer'."

So what units are used? What does a value of 500 mean - 500 characters?
pixels?


In GNU Emacs 22.0.50.1 (i386-msvc-nt5.1.2600)
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