How to count *screen* lines?

[J Krugman]

Is there a way to count the number of lines as they would appear
on the screen (i.e. taking into account line wrapping, if any)?
For instance, a line that took up 100 (non-tab) characters in the
buffer, and the current window width was 80 characters, would
correspond to a screen line count of 2.

Thanks!

jill

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