By displaying them pre-init:
a) eshell will not have loaded, ensuring any user-popup rules in
an (after! eshell ...) block don't load in time for the first eshell
popup,
b) Popup predicate functions don't have access to the full state of the
buffer, if needed.
BREAKING CHANGE: previously, <leader> o t commands would only hide the
terminal popup if it was focused. If not, they would move the focus to
the terminal window. This is unintuitive to the "toggle" description,
and arguably less useful, since refocusing to the terminal can be easily
done with regular window refocus commands. Therefore, <leader> o t now
just hides the terminal popup.
Fix#3374
