Refresh buffer while in Tmux copy mode?

While in copy mode (Ctrl+[) is there a way to refresh the buffer without having to leave copy mode?

This would be helpful while scrolling through long running output.

Solution

There's a refresh-from-pane ^{(requires tmux 3.2+)} command in copy mode. The default key binding for it is r.

To check if you tmux supports refresh-from-pane:

$ tmux list-keys -T copy-mode | grep refresh-from-pane
bind-key -T copy-mode r  send-keys -X refresh-from-pane
$ tmux list-keys -T copy-mode-vi | grep refresh-from-pane
bind-key -T copy-mode-vi r  send-keys -X refresh-from-pane