Eli Zaretskii <eliz@gnu.org> writes:

>> The way I read Eli's above message, it boils down to extending the C
>> function `window_wants_mode_line` with a couple of special cases.
>> Something like the following (mildly tested):

> Thanks, this is an elegant solution.  A few minor comments:


Thanks for reviewing, I'm attaching an updated patch below.

Regarding this comment:

>> +/**
>> + * null_header_line_format:
>> + *
>> + * Return 1 when header line format F indicates that the header line
>> + * should not be displayed at all.

> We usually say "Return non-zero", not 1.

I've changed the wording accordingly, note that some other functions
that return `bool` in src/window.c currently say "Return 1",
e.g. `window_wants_header_line`.

> And finally, please accompany the change with a suitable commit log
> message, an entry in NEWS, and a change for the ELisp manual.

Sure, here's the new patch: