Hey Michael,
Well, focus will not actually be updated, i.e. no communication from i3
to X11 happens because of our state machine model. con_focus() and
rendering the tree are both supposed to work at any time and be pretty
fast, so it’s not a big concern.
In case you feel strongly about this, you could send a patch which would
short-circuit this code path and then try all the weird corner cases we
have (various layouts, decoration styles, mouse transitions between
monitors, etc.). Personally, I don’t think that’s worth it.