On Monday, December 16, 2013 10:58:06 PM UTC-5, Terry Reedy wrote:

> I would not assume that the default covers more than ascii.

In this case, I already know that the glyphs I chose work with the default 
fonts for OS X 10.4+ and Windows 7+, but not for (for example) Win XP.

> But to answer your question, this might work: fonts have a measure() 
> method that returns what the pixel length of a string would be if it 
> were to be displayed.

Thanks. Unfortunately, measure() doesn't seem to do the trick -- it's giving me 
answers that look like normal single-width characters, for glyphs that actually 
render as \uNNNN. Oh well. :/
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