Make send-keys without any arguments send the key it is bound to (if

any). GitHub issue 2904.

cmd-send-keys.c

@@ -202,6 +202,12 @@ cmd_send_keys_exec(struct cmd *self, struct cmdq_item *item)
 		wp->flags |= (PANE_STYLECHANGED|PANE_REDRAW);
 	}
 
+	if (count == 0) {
+		for (; np != 0; np--)
+			cmd_send_keys_inject_key(item, NULL, event->key);
+		return (CMD_RETURN_NORMAL);
+	}
+
 	for (; np != 0; np--) {
 		for (i = 0; i < count; i++) {
 			after = cmd_send_keys_inject_string(item, after, args,

tmux.1

@@ -3123,6 +3123,7 @@ or
 to send; if the string is not recognised as a key, it is sent as a series of
 characters.
 All arguments are sent sequentially from first to last.
+If no keys are given and the command is bound to a key, then that key is used.
 .Pp
 The
 .Fl l