A brief follow-up: Bruno Manzoni's patch at https://moodle.org/mod/forum/discuss.php?d=270112 provides an adequate fix, as long as you're working with the Atto editor. This works for me, because I've already got a Style Guide that uses H1 and H2 for blocks in a course page, and H3 - H5 in articles and wiki pages - which map to "Heading (Large)" down to "Heading (small)" in Atto. I just have to remember to reapply the patch after every upgrade. . .
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