[PATCH wayland] server: Make serial number 0 mean invalid

[Jasper St. Pierre]

In one case, an invalid serial dictates that the window should have it's
focus attempts prevented. In the no-serial case, focus world be stolen.

On Tue, Oct 13, 2015, 10:25 AM Bill Spitzak <spitzak at gmail.com> wrote:

> On 10/13/2015 09:53 AM, Jasper St. Pierre wrote:
> > The goal of focus-stealing prevention isn't to prevent hostile clients
> > from stealing the focus. It's to allow friendly clients to upgrade the
> > experience if they can track the originating event that originally
> > opened a window. For instance, if I launch GIMP but then go back to
> > typing in a terminal, after GIMP launches, it shouldn't steal the
> > focus, because I've interacted with another window since then.
> >
> > We've tried turning off focus-stealing prevention for all new windows
> > without a timestamp, and it provided a very unfun experience. Lots of
> > applications either don't have an originating user action when they
> > pop up a window, or they don't track it thoroughly.
> >
> > Perhaps GUI applications have gotten substantially better in the 6
> > years ago since we tried it -- I'd be willing to run the experiment
> > again. But I don't expect much changing.
>
> Yes but this is still not answering my question.
>
> Can you describe a design where no-event is treated *differently* than
> an unknown or disallowed event in the _present request?
>
> You are describing how they would be treated identically. I suspect that
> will always happen, but the idea that they can be treated differently is
> being used as an excuse to not add the special no-event serial of zero
> and reduce the number of _present messages from 2 to 1.
>
>
>
>
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