Only update the window size if setting the display mode succeeded

src/video/SDL_video.c

@@ -1162,12 +1162,15 @@ SDL_SetWindowDisplayMode(SDL_Window * window, const SDL_DisplayMode * mode)
     if (FULLSCREEN_VISIBLE(window) && (window->flags & SDL_WINDOW_FULLSCREEN_DESKTOP) != SDL_WINDOW_FULLSCREEN_DESKTOP) {
         SDL_DisplayMode fullscreen_mode;
         if (SDL_GetWindowDisplayMode(window, &fullscreen_mode) == 0) {
-            SDL_SetDisplayModeForDisplay(SDL_GetDisplayForWindow(window), &fullscreen_mode);
-            /* make sure the window size (and internals like window-surface size) are adjusted */
-            if (window->w != fullscreen_mode.w || window->h != fullscreen_mode.h) {
-                window->w = fullscreen_mode.w;
-                window->h = fullscreen_mode.h;
-                SDL_OnWindowResized(window);
+            if (SDL_SetDisplayModeForDisplay(SDL_GetDisplayForWindow(window), &fullscreen_mode) == 0) {
+#ifndef ANDROID
+                /* Android may not resize the window to exactly what our fullscreen mode is, especially on
+                 * windowed Android environments like the Chromebook or Samsung DeX.  Given this, we shouldn't
+                 * use fullscreen_mode.w and fullscreen_mode.h, but rather get our current native size.  As such,
+                 * Android's SetWindowFullscreen will generate the window event for us with the proper final size.
+                 */
+                SDL_SendWindowEvent(other, SDL_WINDOWEVENT_RESIZED, fullscreen_mode.w, fullscreen_mode.h);
+#endif
             }
         }
     }
@@ -1364,11 +1367,11 @@ SDL_UpdateFullscreenMode(SDL_Window * window, SDL_bool fullscreen)
                 /* Generate a mode change event here */
                 if (resized) {
 #ifndef ANDROID
-                    // Android may not resize the window to exactly what our fullscreen mode is, especially on
-                    // windowed Android environments like the Chromebook or Samsung DeX.  Given this, we shouldn't
-                    // use fullscreen_mode.w and fullscreen_mode.h, but rather get our current native size.  As such,
-                    // Android's SetWindowFullscreen will generate the window event for us with the proper final size.
-
+                    /* Android may not resize the window to exactly what our fullscreen mode is, especially on
+                     * windowed Android environments like the Chromebook or Samsung DeX.  Given this, we shouldn't
+                     * use fullscreen_mode.w and fullscreen_mode.h, but rather get our current native size.  As such,
+                     * Android's SetWindowFullscreen will generate the window event for us with the proper final size.
+                     */
                     SDL_SendWindowEvent(other, SDL_WINDOWEVENT_RESIZED,
                                         fullscreen_mode.w, fullscreen_mode.h);
 #endif