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, 2 insertions, 1 deletions

diff --git a/sway/input/cursor.c b/sway/input/cursor.c
index aa0e07f5..eab102fd 100644
--- a/sway/input/cursor.c
+++ b/sway/input/cursor.c
@@ -175,7 +175,8 @@ static enum wlr_edges find_edge(struct sway_container *cont,
                 return WLR_EDGE_NONE;
         }
         struct sway_view *view = cont->view;
-        if (view->border == B_NONE || !view->border_thickness || view->using_csd) {
+        if (view->border == B_NONE || !view->border_thickness ||
+                        view->border == B_CSD) {
                 return WLR_EDGE_NONE;
         }