You can see that both calls have come via redisplay(); the difference is
their callers. (Of course both runs of the hook are unnecessary, they have
been carried out because windows_or_buffers_changed = 1.) In the first:
Normally, windows_or_buffers_changed gets cleared near the end of
redisplay_internal. Did the first call to redisplay_internal do that?
If not, why not?
If it did that, where did it get set again
before the second call to redisplay?
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