Currently Implemented Shortcuts
You cannot be focused on the message text entry area to use the navigation shortcuts.
MacOS
control + shift + left arrow or command + shift + left arrow: page to the previous conversation.
control + shift + right arrow or command + shift + right arrow: page to the next conversation.
control + backspace or command + backspace: return from the message list, to the conversation list.
control + n or option + n: create a new message.
control + shift + s or option + shift + s: open the search box.
control + e or option + e: open emoji selector.
Use the arrow keys (up and down) to page through contacts when creating a new message
Windows/Linux
ctrl + shift + left arrow or alt + shift + left arrow: page to the previous conversation.
ctrl + shift + right arrow or alt + shift + right arrow: page to the next conversation.
ctrl + backspace or alt + backspace: return from the message list, to the conversation list.
ctrl + n or alt + n: create a new message.
ctrl + shift + s or alt + shift + s: open the search box.
ctrl + e or alt + e: open emoji selector
Use the arrow keys (up and down) to page through contacts when creating a new message