I welcome your idea! In fact I've been thinking for quite some time we
needed something like this. I don't like the names of the hooks, however,
since they don't seem particularly standard - usually the terminology used
with focus is "focus gained" and "focus lost" (or "on focus" and "on lose
focus").


On 17 November 2013 19:50, Brian Jenkins <brian@brianjenkins.org> wrote:

> Hello.
>
> I'd like to contribute the attached patch, which adds hooks into gain and
> loss of focus events.
>
> This allows saving all buffers on loss of focus.  (Alt-tabbing between
> an editor and browser is a popular workflow for web programmers.)
>
> It also allows reversion of buffers on regain of focus, convenient if
> one is switching between Emacs and another editor.
>
> People will probably find other handy uses for these hooks.
>
> Best,
> Brian Jenkins
>