tmux: Do not auto exit copy-mode when at bottom

Do not exit automatically the copy-mode when reaching the bottom.  This
was especially annoying/dangerous when holding `C-d` down to scroll to
the bottom.

.config/tmux/tmux.conf

@@ -12,6 +12,14 @@ bind-key -T copy-mode-vi MouseDragEnd1Pane \
 # https://github.com/neovim/neovim/wiki/FAQ#cursor-shape-doesnt-change-in-tmux
 set -ga terminal-overrides '*:Ss=\E[%p1%d q:Se=\E[ q'
 
+# Do not exit automatically the copy-mode when reaching the bottom.  This was
+# especially annoying/dangerous when holding C-d down to scroll to the bottom.
+# (This is practically the default binding except for the `-e` flag for
+# `copy-mode`)
+bind -n WheelUpPane if -F "#{||:#{pane_in_mode},#{mouse_any_flag}}" { send -M } { copy-mode -u }
+bind -T copy-mode-vi WheelUpPane   select-pane \; send-keys -XN5 scroll-up
+bind -T copy-mode-vi WheelDownPane select-pane \; send-keys -XN5 scroll-down
+
 # Set C-a as new prefix
 unbind C-b
 set-option -g prefix C-a