Update tmux config > 2.4

tmux/.tmux.conf

@@ -12,7 +12,7 @@ set -s focus-events on
 # set -g prefix2 C-a
 # bind C-a send-prefix -2
 
-set -q -g status-utf8 on
+#set -q -g status-utf8 on
 setw -q -g utf8 on
 
 # edit configuration
@@ -87,9 +87,9 @@ bind Down last-window \; swap-pane -s tmp. \; kill-window -t tmp
 
 # in version 2.3 and below https://github.com/tmux/tmux/commit/76d6d3641f271be1756e41494960d96714e7ee58
 setw -g mode-keys vi
-bind-key -t vi-copy 'v' begin-selection
-bind-key -t vi-copy 'C-v' rectangle-toggle
-bind-key -t vi-copy 'y' copy-selection
+bind-key -T copy-mode-vi 'v' send -X begin-selection     # Begin selection in copy mode.
+bind-key -T copy-mode-vi 'C-v' send -X rectangle-toggle  # Begin selection in copy mode.
+bind-key -T copy-mode-vi 'y' send -X copy-selection      # Yank selection in copy mode.
 # https://superuser.com/a/693990/298782
 
 # Smart pane switching with awareness of Vim splits.