I finally got my question answered! It had been vexing me for some time, and finally at my appointment a couple days ago I worked up the courage to ask.
The answer is: Floss first, because the brushing will clear away the dislodged matter. However, it doesn't really matter, because you'll be rinsing out your mouth anyway.
Packbat ... out!
Edit:
chanlemur reports that his dentist recommended the opposite, on the grounds that the floss may carry fluoridated residue from the brushing into the gaps between the teeth. Please, ask your dentist that we may clear up this controversy!
The answer is: Floss first, because the brushing will clear away the dislodged matter. However, it doesn't really matter, because you'll be rinsing out your mouth anyway.
Packbat ... out!
Edit:
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