Gpg never asks for password in an X session which had `gpg --decrypt`

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2019-11-08 (Friday), nixos1@discoursemail.com (Doron Behar via NixOS Discourse):

If I run gpg --decrypt ... and then pkill gpg-agent I need
to reenter my password on the next gpg --decrypt ... -
everything is fine.

How do you run the gpg-agent? Do have gpg launch it on demand
or are you using socket activation?

If I login to a certain TTY and run a gpg --decrypt command
and then startx, I can’t make the agent forget my password.
Even if I kill it from htop it doesn’t ask for a password.

What pinentry program do you use (grep ^pinentry-program ~/.gnupg/gpg-agent.conf)? When the agent loses track of the
session you’re on it may end up spawning the pinentry on a
different terminal, like the one on the console that’s being
assumed by your x session.