tie xdg_toplevel_decorations to Client

a xdg_toplevel can only have one xdg_toplevel_decoration so there is no need to
have a new struct for decorations

dwl.c

@@ -111,6 +111,7 @@ typedef struct {
 		struct wlr_xdg_surface *xdg;
 		struct wlr_xwayland_surface *xwayland;
 	} surface;
+	struct wlr_xdg_toplevel_decoration_v1 *decoration;
 	struct wl_listener commit;
 	struct wl_listener map;
 	struct wl_listener maximize;
@@ -118,6 +119,8 @@ typedef struct {
 	struct wl_listener destroy;
 	struct wl_listener set_title;
 	struct wl_listener fullscreen;
+	struct wl_listener set_decoration_mode;
+	struct wl_listener destroy_decoration;
 	struct wlr_box prev; /* layout-relative, includes border */
 	struct wlr_box bounds;
 #ifdef XWAYLAND
@@ -133,11 +136,6 @@ typedef struct {
 	uint32_t resize; /* configure serial of a pending resize */
 } Client;
 
-typedef struct {
-	struct wl_listener request_mode;
-	struct wl_listener destroy;
-} Decoration;
-
 typedef struct {
 	uint32_t mod;
 	xkb_keysym_t keysym;
@@ -256,6 +254,7 @@ static void createmon(struct wl_listener *listener, void *data);
 static void createnotify(struct wl_listener *listener, void *data);
 static void createpointer(struct wlr_pointer *pointer);
 static void cursorframe(struct wl_listener *listener, void *data);
+static void destroydecoration(struct wl_listener *listener, void *data);
 static void destroydragicon(struct wl_listener *listener, void *data);
 static void destroyidleinhibitor(struct wl_listener *listener, void *data);
 static void destroylayersurfacenotify(struct wl_listener *listener, void *data);
@@ -264,14 +263,12 @@ static void destroylocksurface(struct wl_listener *listener, void *data);
 static void destroynotify(struct wl_listener *listener, void *data);
 static void destroysessionlock(struct wl_listener *listener, void *data);
 static void destroysessionmgr(struct wl_listener *listener, void *data);
-static void destroyxdeco(struct wl_listener *listener, void *data);
 static Monitor *dirtomon(enum wlr_direction dir);
 static void focusclient(Client *c, int lift);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
 static Client *focustop(Monitor *m);
 static void fullscreennotify(struct wl_listener *listener, void *data);
-static void getxdecomode(struct wl_listener *listener, void *data);
 static void handlesig(int signo);
 static void incnmaster(const Arg *arg);
 static void inputdevice(struct wl_listener *listener, void *data);
@@ -297,6 +294,7 @@ static void pointerfocus(Client *c, struct wlr_surface *surface,
 static void printstatus(void);
 static void quit(const Arg *arg);
 static void rendermon(struct wl_listener *listener, void *data);
+static void requestdecorationmode(struct wl_listener *listener, void *data);
 static void requeststartdrag(struct wl_listener *listener, void *data);
 static void requestmonstate(struct wl_listener *listener, void *data);
 static void resize(Client *c, struct wlr_box geo, int interact);
@@ -743,13 +741,14 @@ commitnotify(struct wl_listener *listener, void *data)
 void
 createdecoration(struct wl_listener *listener, void *data)
 {
-	struct wlr_xdg_toplevel_decoration_v1 *wlr_deco = data;
+	struct wlr_xdg_toplevel_decoration_v1 *deco = data;
-	Decoration *d = wlr_deco->data = calloc(1, sizeof(*d));
+	Client *c = deco->toplevel->base->data;
+	c->decoration = deco;
 
-	LISTEN(&wlr_deco->events.request_mode, &d->request_mode, getxdecomode);
+	LISTEN(&deco->events.request_mode, &c->set_decoration_mode, requestdecorationmode);
-	LISTEN(&wlr_deco->events.destroy, &d->destroy, destroyxdeco);
+	LISTEN(&deco->events.destroy, &c->destroy_decoration, destroydecoration);
 
-	getxdecomode(&d->request_mode, wlr_deco);
+	requestdecorationmode(&c->set_decoration_mode, deco);
 }
 
 void
@@ -1017,6 +1016,15 @@ cursorframe(struct wl_listener *listener, void *data)
 	wlr_seat_pointer_notify_frame(seat);
 }
 
+void
+destroydecoration(struct wl_listener *listener, void *data)
+{
+	Client *c = wl_container_of(listener, c, destroy_decoration);
+
+	wl_list_remove(&c->destroy_decoration.link);
+	wl_list_remove(&c->set_decoration_mode.link);
+}
+
 void
 destroydragicon(struct wl_listener *listener, void *data)
 {
@@ -1131,17 +1139,6 @@ destroysessionmgr(struct wl_listener *listener, void *data)
 	wl_list_remove(&listener->link);
 }
 
-void
-destroyxdeco(struct wl_listener *listener, void *data)
-{
-	struct wlr_xdg_toplevel_decoration_v1 *wlr_deco = data;
-	Decoration *d = wlr_deco->data;
-
-	wl_list_remove(&d->destroy.link);
-	wl_list_remove(&d->request_mode.link);
-	free(d);
-}
-
 Monitor *
 dirtomon(enum wlr_direction dir)
 {
@@ -1292,14 +1289,6 @@ fullscreennotify(struct wl_listener *listener, void *data)
 	setfullscreen(c, client_wants_fullscreen(c));
 }
 
-void
-getxdecomode(struct wl_listener *listener, void *data)
-{
-	struct wlr_xdg_toplevel_decoration_v1 *wlr_deco = data;
-	wlr_xdg_toplevel_decoration_v1_set_mode(wlr_deco,
-			WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE);
-}
-
 void
 handlesig(int signo)
 {
@@ -1903,6 +1892,14 @@ skip:
 	wlr_output_state_finish(&pending);
 }
 
+void
+requestdecorationmode(struct wl_listener *listener, void *data)
+{
+	Client *c = wl_container_of(listener, c, set_decoration_mode);
+	wlr_xdg_toplevel_decoration_v1_set_mode(c->decoration,
+			WLR_XDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE);
+}
+
 void
 requeststartdrag(struct wl_listener *listener, void *data)
 {