On 6/27/22 12:54, Eli Zaretskii wrote:
> Your test calls with-current-buffer-window, which calls
> temp-buffer-window-setup, which inhibits modification hooks:

Yup, that's it!  If I set `inhibit-modification-hooks' back to nil then it works.  Thank you.

I thought I had a `(should (null inhibit-modification-hooks))` at some point in the past to rule that out, but I must not have had that inside the `with-current-buffer-window'.

Perhaps the documentation should be updated to indicate that the modification hooks are inhibited?  I can cook up a patch.