Add an option to not show message-preview in chat-list

The chat-list shows a preview of the latest message for every chat.

I find it distracting to be shown a mix of random messages whenever i am looking for a chat to open, or when i am manually checking for new messages.

It would be nice to have an option to not show the message-previews in the chat-list.
Perhaps with another option to only show it for new messages; so that the focus is on new messages, instead of messages that were already read.