Open
Description
Drop it, because it doesn't make sense. If there are no monitors in the given direction the command should always fail regardless of the flag (and it already behaves this way)
--fail-if-noop
is a noop flag for move-node-to-monitor <direction>
The suggestion is obviously a breaking change
Please note that move-node-to-monitor <monitor-pattern>...
should stay unchanged. --fail-if-noop
makes perfect sense for it.