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, 13 insertions, 7 deletions

diff --git a/sway/desktop/xwayland.c b/sway/desktop/xwayland.c
index a12ac854..f1205518 100644
--- a/sway/desktop/xwayland.c
+++ b/sway/desktop/xwayland.c
@@ -243,12 +243,14 @@ static bool wants_floating(struct sway_view *view) {
         return false;
 }
 
-static bool has_client_side_decorations(struct sway_view *view) {
-        if (xwayland_view_from_view(view) == NULL) {
-                return false;
-        }
-        struct wlr_xwayland_surface *surface = view->wlr_xwayland_surface;
-        return surface->decorations != WLR_XWAYLAND_SURFACE_DECORATIONS_ALL;
+static void handle_set_decorations(struct wl_listener *listener, void *data) {
+        struct sway_xwayland_view *xwayland_view =
+                wl_container_of(listener, xwayland_view, set_decorations);
+        struct sway_view *view = &xwayland_view->view;
+        struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
+
+        bool csd = xsurface->decorations != WLR_XWAYLAND_SURFACE_DECORATIONS_ALL;
+        view_set_csd_from_client(view, csd);
 }
 
 static void _close(struct sway_view *view) {
@@ -274,7 +276,6 @@ static const struct sway_view_impl view_impl = {
         .set_tiled = set_tiled,
         .set_fullscreen = set_fullscreen,
         .wants_floating = wants_floating,
-        .has_client_side_decorations = has_client_side_decorations,
         .close = _close,
         .destroy = destroy,
 };
@@ -343,6 +344,7 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
         wl_list_remove(&xwayland_view->set_role.link);
         wl_list_remove(&xwayland_view->set_window_type.link);
         wl_list_remove(&xwayland_view->set_hints.link);
+        wl_list_remove(&xwayland_view->set_decorations.link);
         wl_list_remove(&xwayland_view->map.link);
         wl_list_remove(&xwayland_view->unmap.link);
         view_begin_destroy(&xwayland_view->view);
@@ -613,6 +615,10 @@ void handle_xwayland_surface(struct wl_listener *listener, void *data) {
         wl_signal_add(&xsurface->events.set_hints, &xwayland_view->set_hints);
         xwayland_view->set_hints.notify = handle_set_hints;
 
+        wl_signal_add(&xsurface->events.set_decorations,
+                        &xwayland_view->set_decorations);
+        xwayland_view->set_decorations.notify = handle_set_decorations;
+
         wl_signal_add(&xsurface->events.unmap, &xwayland_view->unmap);
         xwayland_view->unmap.notify = handle_unmap;