On Dec 2, 2020, at 1:24 PM, Sean Devlin <spd@toadstyle.org> wrote:

Hi Martin,

Thanks for all the helpful info!

On Dec 2, 2020, at 2:52 AM, martin rudalics <rudalics@gmx.at> wrote:

I forgot to say that _all_ normal mini window resizing goes through
'window--resize-root-window-vertically' in window.el.  So it will
probably suffice to instrument just that function (in an already running
Emacs only, else you have to rebuild because window.el is preloaded) and
don't have to tinker with C code at all.

Imprecise again: The above covers only the automatic resizing triggered
by redisplay (which is what we are interested in).  Manual resizing the
minibuffer window is done in 'window--resize-mini-window' (also in
window.el) so if such manual resizing may happen in between you have to
instrument that as well.

I see, I’ll take a look at these functions. Thanks!

martin