Message List does not scroll up or down when navigating with keyboard

Expected behavior

Tell us what should happen

When I browse through the messages list (ML) or delete a message with keyboard bindings, the list should scroll up or down to show the currently selected email.

I am navigating mostly with keyboard in my list, so I don't scroll to go up or down.
When I reach the bottom of the ML, the selected email is not visible in the ML
When I get up in the ML with keyboard, the ML doesn't scroll to keep the selected message visible
When I remove many emails, the same issue as brosing the ML up happens.

In the "UP" case, we are also fooled by the fixed top bar, which hides a potentially visible message (the light tick line is the bottom of the selected email):

Actual behavior

Tell us what happens instead

The list didn't scroll, and I don't know where my selection is.

Mail app

Mail app version: (see apps admin page, e.g. 0.5.3)

Mailserver or service: (e.g. Outlook, Yahoo, Gmail, Exchange,...) unified inbox

Server configuration

Operating system: (e.g. Debian 8) Debian 10 (Raspbian, actually)

Web server: (e.g. Apache, Nginx,...) nginx

Database: (e.g. MariaDB, SQLite or PostgreSQL) Mariadb

PHP version: (e.g. 7.0) 7.3

Nextcloud Version: (see admin page, e.g. 13.0.2) 20.0.7

Client configuration

Browser: (e.g. Firefox 48) Opera 75

Operating system: (e.g. Arch Linux) Linux Mint 20.1

Start from the message list's keyboard navigation and selection behavior, including navigation and deletion bindings. Reproduce the issue by moving through the list and deleting messages with the keyboard, then verify that the selected email remains visible above or below the fixed top bar.