[PATCH wayland-protcols v3] unstable: add xdg-toplevel-decoration protocol

[Drew DeVault]

To summarize the state of affairs here, the purpose of this protocol is
to communicate:

- The compositor's preference to use SSD or leave the client to its own
  devices
- The choice of the client to have SSD displayed

We can completely remove CSD from the question because the term is
barely meaningful. CSD is just a code-word for "some client-provided
mechanism for window manipulation". SSD on the other hand is an apt
description for what the server is going to do here.

I think we can settle the matter by making the following change to
Simon's proposal:

    <enum name="mode">
      <description summary="window decoration modes">
        These values describe window decoration modes.
      </description>
-     <entry name="client_side" value="1" summary="client-side window decoration"/>
-     <entry name="server_side" value="2" summary="server-side window decoration"/>
+     <entry name="server_side" value="1" summary="server-side window decoration"/>
+     <entry name="none" value="2" summary="no window decoration"/>
    </enum>

Then updating the prose accordingly. We can include a note along the
lines of "if the client chooses not to use server-side decorations, it
is responsible for its own window management operations."

--
Drew DeVault