[PATCH] docs: Add a note about unmapping surfaces without content

[Jason Ekstrand]

Looks Good!
--Jason Ekstrand

On Sat, Mar 30, 2013 at 1:36 PM,  <matthias.clasen at gmail.com> wrote:
> From: Matthias Clasen <mclasen at redhat.com>
>
> Explanation received on wayland-devel indicates that it is
> expected compositor behaviour to unmap surfaces without content.
> ---
>  protocol/wayland.xml | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/protocol/wayland.xml b/protocol/wayland.xml
> index 718a4a5..548b1b9 100644
> --- a/protocol/wayland.xml
> +++ b/protocol/wayland.xml
> @@ -923,6 +923,9 @@
>
>         Only if wl_surface.attach is sent with a NULL wl_buffer, the
>         following wl_surface.commit will remove the surface content.
> +        It is up to the compositor implementation how it will treat
> +        a surface without content; a common behaviour is to unmap
> +        the surface until it gets defined content again.
>        </description>
>
>        <arg name="buffer" type="object" interface="wl_buffer" allow-null="true"/>
> --
> 1.8.2
>
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