Re: [PATCH] frame.c: focus hooks

[Stefan Monnier]

> Unfortunately, no.  The "focus in" and "focus out" events in Emacs fire
> per frame.  So alt-tabbing between Emacs frames will trigger a focus loss
> event for the origin frame and focus gain for the destination frame

Indeed, that's a problem in the current implementation, but that's not
the fault of your patch (your patch only makes the existing `focus-in'
and `focus-out' special events available via hooks, which is indeed more
convenient).

> It's not clear to me that X itself even *has* a concept of "active
> application" distinct from "frame that has input focus".

That's right: X11 has no such concept, AFAIK.  So we can't avoid
receiving a FocusOut/FocusIn pair of X11 events.  Hopefully, someone
will figure out how to cancel out such pairs in the C code so they don't
result in a `focus-in' and `focus-out' pair of Lisp-level events.


        Stefan