Hi all, this is a reply to the topic of whether to have information about decorations in the xdg_shell at all (see [1]). Sorry that I don't reply to the right message, had not been subscribed to the list.
I want to outline why we in the KDE Plasma team would prefer to have the possibility to tell clients whether to draw decorations or not. In Plasma we have multiple shells and will be able to switch at runtime. From the window manager perspective the main difference is currently the handling of window decorations. Our touch oriented shell doesn't have decorated windows, our netbook shell only has decorated windows for dialogs and our desktop shell has a typical window decorated style, but not enforcing SSD (there are valid use cases like yakuake). This gives us quite some flexibility to adjust at runtime (add keyboard to tablet to get a desktop). An application doesn't need to know what the shell currently looks like. The shell takes care of handling all of that. If we don't have information about whether the window should be decorated or not in the xdg_shell we would need to adjust all applications to know about our various shells. Otherwise a consistent user experience would not be possible. Also it removes all possibilities to take this further in the future. Now I don't want to force SSD to anybody nor do I want to be forced to CSD. Therefore I want to have a very simple spec, which allows the compositor to tell the clients whether they are expected to render decos themselves (enforce CSD, e.g. GNOME Shell), whether the compositor doesn't care, but prefer them to not render themselves (e.g. Plasma Desktop case) or whether the compositor wants the client to not render any handles at all (enforce SSD, Plasma Active case). In addition the client should tell the compositor whether it draws handles or not. So that the SSD-supporting compositor doesn't add a decoration around a CSD client. I think this would be a good solution. It would require clients to support CSD, but also to not render them in shells, which prefer to not have them. Also it doesn't force CSD applications to support it. They could just announce that they do CSD no matter what. Opinions? Would that be acceptable for everybody? Cheers Martin Gräßlin [1] http://lists.freedesktop.org/archives/wayland-devel/2013-November/011980.html
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