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From: Richard Stallman <rms@gnu.org>
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Subject: Re: column int->float diff
Date: Tue, 4 Jun 2002 17:27:33 -0600 (MDT)
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    It's possible that indent.c should look at the glyph matrices, where this 
    information is already spelled out.

I don't think there is any way to determine reliably whether
part of the glyph matrices correspond correctly to the buffer.
So you could only do this when redisplay is up-to-date for the buffer.
At that point, you know the glyph matrices do match the buffer text.

I tend to think it is not worth the trouble of writing special code to
handle that particular case.