When I'm in a multi-pane tmux window, on the leftmost pane, pressing my shortcut to move to the pane to the left will cyclically move the focus to the rightmost pane. I would prefer this shortcut to take no action in this case, i.e., to stay in the already selected leftmost pane.
select-pane command in tmux has a lot of switches, but they are not documented:
$ tmux select-pane --help usage: select-pane [-DdegLlMmRU] [-P style] [-T title] [-t target-pane]
In case it's relevant, my shortcuts to select the panes are as follows:
bind -n C-M-h select-pane -L bind -n C-M-j select-pane -D bind -n C-M-k select-pane -U bind -n C-M-l select-pane -R