SDL: wayland: Initialize floating size at window creation

SDL Commits
1 
From b5210cac44b5d2f58713a4b1399e1ea262743943 Mon Sep 17 00:00:00 2001
From: Sebastian Krzyszkowiak <[EMAIL REDACTED]>
Date: Mon, 2 Aug 2021 13:47:32 +0200
Subject: [PATCH] wayland: Initialize floating size at window creation

This allows the windowed size to be restored for windows initially
created already in non-floating state.
---
 src/video/wayland/SDL_waylandwindow.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/video/wayland/SDL_waylandwindow.c b/src/video/wayland/SDL_waylandwindow.c
index 80384c7b0..e74d43b81 100644
--- a/src/video/wayland/SDL_waylandwindow.c
+++ b/src/video/wayland/SDL_waylandwindow.c
@@ -1132,6 +1132,9 @@ int Wayland_CreateWindow(_THIS, SDL_Window *window)
     data->outputs = NULL;
     data->num_outputs = 0;
 
+    data->floating_width = window->windowed.w;
+    data->floating_height = window->windowed.h;
+
     data->surface =
         wl_compositor_create_surface(c->compositor);
     wl_surface_add_listener(data->surface, &surface_listener, data);