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, 17 insertions, 4 deletions

diff --git a/sway/commands/border.c b/sway/commands/border.c
index 95498b2f..673fea08 100644
--- a/sway/commands/border.c
+++ b/sway/commands/border.c
@@ -7,6 +7,17 @@
 #include "sway/tree/container.h"
 #include "sway/tree/view.h"
 
+static void set_border(struct sway_view *view,
+                enum sway_container_border new_border) {
+        if (view->border == B_CSD && new_border != B_CSD) {
+                view_set_csd_from_server(view, false);
+        } else if (view->border != B_CSD && new_border == B_CSD) {
+                view_set_csd_from_server(view, true);
+        }
+        view->saved_border = view->border;
+        view->border = new_border;
+}
+
 struct cmd_results *cmd_border(int argc, char **argv) {
         struct cmd_results *error = NULL;
         if ((error = checkarg(argc, "border", EXPECTED_AT_LEAST, 1))) {
@@ -21,13 +32,15 @@ struct cmd_results *cmd_border(int argc, char **argv) {
         struct sway_view *view = container->view;
 
         if (strcmp(argv[0], "none") == 0) {
-                view->border = B_NONE;
+                set_border(view, B_NONE);
         } else if (strcmp(argv[0], "normal") == 0) {
-                view->border = B_NORMAL;
+                set_border(view, B_NORMAL);
         } else if (strcmp(argv[0], "pixel") == 0) {
-                view->border = B_PIXEL;
+                set_border(view, B_PIXEL);
+        } else if (strcmp(argv[0], "csd") == 0) {
+                set_border(view, B_CSD);
         } else if (strcmp(argv[0], "toggle") == 0) {
-                view->border = (view->border + 1) % 3;
+                set_border(view, (view->border + 1) % 4);
         } else {
                 return cmd_results_new(CMD_INVALID, "border",
                                 "Expected 'border <none|normal|pixel|toggle>' "