wayland: Set the border state before the initial configure

This allows the toplevel bounds to be set correctly on borderless windows.

src/video/wayland/SDL_waylandwindow.c

@@ -1832,6 +1832,7 @@ void Wayland_ShowWindow(SDL_VideoDevice *_this, SDL_Window *window)
         } else {
             libdecor_frame_set_app_id(data->shell_surface.libdecor.frame, data->app_id);
             libdecor_frame_map(data->shell_surface.libdecor.frame);
+            libdecor_frame_set_visibility(data->shell_surface.libdecor.frame, !(window->flags & SDL_WINDOW_BORDERLESS));
 
             if (c->zxdg_exporter_v2) {
                 data->exported = zxdg_exporter_v2_export_toplevel(c->zxdg_exporter_v2, data->surface);
@@ -1917,6 +1918,14 @@ void Wayland_ShowWindow(SDL_VideoDevice *_this, SDL_Window *window)
             xdg_toplevel_set_app_id(data->shell_surface.xdg.toplevel.xdg_toplevel, data->app_id);
             xdg_toplevel_add_listener(data->shell_surface.xdg.toplevel.xdg_toplevel, &toplevel_listener_xdg, data);
 
+            // Create the window decorations
+            if (c->decoration_manager) {
+                data->server_decoration = zxdg_decoration_manager_v1_get_toplevel_decoration(c->decoration_manager, data->shell_surface.xdg.toplevel.xdg_toplevel);
+                zxdg_toplevel_decoration_v1_add_listener(data->server_decoration, &decoration_listener, window);
+                const enum zxdg_toplevel_decoration_v1_mode mode = !(window->flags & SDL_WINDOW_BORDERLESS) ? ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE : ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE;
+                zxdg_toplevel_decoration_v1_set_mode(data->server_decoration, mode);
+            }
+
             if (c->zxdg_exporter_v2) {
                 data->exported = zxdg_exporter_v2_export_toplevel(c->zxdg_exporter_v2, data->surface);
                 zxdg_exported_v2_add_listener(data->exported, &exported_v2_listener, data);
@@ -1955,13 +1964,6 @@ void Wayland_ShowWindow(SDL_VideoDevice *_this, SDL_Window *window)
     } else
 #endif
         if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP || data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
-
-        // Create the window decorations
-        if (data->shell_surface_type != WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP && data->shell_surface.xdg.toplevel.xdg_toplevel && c->decoration_manager) {
-            data->server_decoration = zxdg_decoration_manager_v1_get_toplevel_decoration(c->decoration_manager, data->shell_surface.xdg.toplevel.xdg_toplevel);
-            zxdg_toplevel_decoration_v1_add_listener(data->server_decoration, &decoration_listener, window);
-        }
-
         /* Unlike libdecor we need to call this explicitly to prevent a deadlock.
          * libdecor will call this as part of their configure event!
          * -flibit