Ctrl+C in pg:psql exiting

[afn]

I believe this is the same issue originally reported in heroku/heroku-pg#116. I'm seeing it with the current version of heroku-cli:

[afn]$ heroku update
Updating completions... ⡿ [1/4] Resolving packages...
Updating completions... ⣻ [1/4] Resolving packages...
[afn]$ heroku --version
heroku/7.25.0 linux-x64 node-v11.14.0

Current behavior: hitting Ctrl+C inside pg:psql interrupts the current query but does not cause psql to exit

Actual behavior: psql exits immediately on Ctrl+C. It also ends up printing some output after control has returned to the shell.

Example:

[afn]$ heroku pg:psql -r prod
--> Connecting to postgresql-xxx-xxx
psql (11.2, server 9.6.12)
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)
Type "help" for help.

xxx::DATABASE=> select pg_sleep(5);
^C !    Command cancelled.
[afn]$ Cancel request sent
ERROR:  canceling statement due to user request
amitree::DATABASE=> 
\q
[afn]$