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

[Pekka Paalanen]

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.


Thanks,
pq
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