Add CSD to border modes

This replaces view.using_csd with a new border mode: B_CSD. This also
removes sway_xdg_shell{_v6}_view.deco_mode and
view->has_client_side_decorations as we can now get these from the
border.

You can use `border toggle` to cycle through the modes including CSD, or
use `border csd` to set it directly. The client must support the
xdg-decoration protocol, and the only client I know of that does is the
example in wlroots.

If the client switches from SSD to CSD without us expecting it (via the
server-decoration protocol), we stash the previous border type into
view.saved_border so we can restore it if the client returns to SSD. I
haven't found a way to test this though.

1 files changed, 5 insertions, 0 deletions

diff --git a/include/sway/server.h b/include/sway/server.h
index 5dabb61f..3e1cbb33 100644
--- a/include/sway/server.h
+++ b/include/sway/server.h
@@ -54,6 +54,10 @@ struct sway_server {
         struct wl_listener server_decoration;
         struct wl_list decorations; // sway_server_decoration::link
 
+        struct wlr_xdg_decoration_manager_v1 *xdg_decoration_manager;
+        struct wl_listener xdg_decoration;
+        struct wl_list xdg_decorations; // sway_xdg_decoration::link
+
         size_t txn_timeout_ms;
         list_t *transactions;
         list_t *dirty_nodes;
@@ -78,5 +82,6 @@ void handle_xdg_shell_surface(struct wl_listener *listener, void *data);
 void handle_xwayland_surface(struct wl_listener *listener, void *data);
 #endif
 void handle_server_decoration(struct wl_listener *listener, void *data);
+void handle_xdg_decoration(struct wl_listener *listener, void *data);
 
 #endif