Handle fullscreen flag when mapping a surface.

sway/desktop/wl_shell.c

@@ -128,4 +128,8 @@ void handle_wl_shell_surface(struct wl_listener *listener, void *data) {
 	wl_signal_add(&shell_surface->events.destroy, &wl_shell_view->destroy);
 
 	view_map(&wl_shell_view->view, shell_surface->surface);
+
+	if (shell_surface->state == WLR_WL_SHELL_SURFACE_STATE_FULLSCREEN) {
+		view_set_fullscreen(&wl_shell_view->view, true);
+	}
 }

sway/desktop/xdg_shell_v6.c

@@ -212,6 +212,10 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	xdg_shell_v6_view->new_popup.notify = handle_new_popup;
 	wl_signal_add(&xdg_surface->events.new_popup,
 		&xdg_shell_v6_view->new_popup);
+
+	if (xdg_surface->toplevel->current.fullscreen) {
+		view_set_fullscreen(view, true);
+	}
 }
 
 static void handle_destroy(struct wl_listener *listener, void *data) {

sway/desktop/xwayland.c

@@ -248,6 +248,10 @@ static void handle_map(struct wl_listener *listener, void *data) {
 	// Put it back into the tree
 	wlr_xwayland_surface_set_maximized(xsurface, true);
 	view_map(view, xsurface->surface);
+
+	if (xsurface->fullscreen) {
+		view_set_fullscreen(view, true);
+	}
 }
 
 static void handle_destroy(struct wl_listener *listener, void *data) {