SDL: wayland: Calculate the fullscreen exclusive pointer scale from the viewport dimensions

SDL Commits
1 
From 03ceaca19c06732381b39d5353f05d1d1805199d Mon Sep 17 00:00:00 2001
From: Frank Praznik <[EMAIL REDACTED]>
Date: Sun, 19 Apr 2026 23:31:00 -0400
Subject: [PATCH] wayland: Calculate the fullscreen exclusive pointer scale
 from the viewport dimensions

Fixes the pointer scale when using the aspect-correct scaling mode.
---
 src/video/wayland/SDL_waylandwindow.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/video/wayland/SDL_waylandwindow.c b/src/video/wayland/SDL_waylandwindow.c
index 20da36b6339ed..43ccce42e701e 100644
--- a/src/video/wayland/SDL_waylandwindow.c
+++ b/src/video/wayland/SDL_waylandwindow.c
@@ -362,8 +362,8 @@ static void ConfigureWindowGeometry(SDL_Window *window)
                 data->current.logical_height = window->current_fullscreen_mode.h;
             }
 
-            data->pointer_scale.x = (double)window_width / (double)data->current.logical_width;
-            data->pointer_scale.y = (double)window_height / (double)data->current.logical_height;
+            data->pointer_scale.x = (double)window_width / (double)viewport_width;
+            data->pointer_scale.y = (double)window_height / (double)viewport_height;
         }
     } else {
         if (!data->scale_to_display) {