[RFC wayland-protocols 1/1] Add Primary Selection Protocol Version 1

[Bill Spitzak]

On Mon, Dec 14, 2015 at 9:13 AM, Pekka Paalanen <ppaalanen at gmail.com> wrote:

> On Mon, 14 Dec 2015 10:39:05 -0500
> Lyude <cpaul at redhat.com> wrote:
>
> > On Sat, 2015-12-12 at 11:29 -0800, Bill Spitzak wrote:
> > > I don't think you need the word "primary" in there. It can be called
> the
> > > selection. The other thing this is confused with is called the
> "clipboard".
> > >
> > > Glad to see you reusing the dnd protocol. X selection and
> middle-button paste
> > > is really a form of DnD, but with the advantage that the user can
> rearrage and
> > > open and close windows between when they start and finish the drag.
> > Alright I'm a bit confused here since I'm getting conflicting opinions
> on this.
> > Should we be reusing the dnd protocol or not? Giulio seems to think we
> shouldn't
> > be reusing the data offer objects here, but I would have thought that
> makes the
> > most sense here seeing as the functionality of a
> wp_primary_(offer|source) would
> > be pretty much identical to the wl_data_(offer|source) objects.
>
> Giulio is right.
>
> You must not break the versioning (hierarchy) of protocol objects.
> See:
> http://wayland.freedesktop.org/docs/html/ch04.html#sect-Protocol-Versioning
>
> Having two different global interfaces that (or their child
> interfaces, i.e. the interfaces of objects that can be created from
> these) can create objects with the same interface will not allow
> that interface to be extended, because the interface version becomes
> ambiguous.
>
> Examples of interfaces that are already impossible to extend are
> wl_buffer and wl_callback. For wl_buffer there is a good reason to
> break the rule and take the hit of being stuck at version 1
> forever, but I think it was more of an accident than intentional
> design originally.
>

He is not creating the DnD objects with the new api, just reusing them.
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