Fixed view frame from flipping back and forth between landscape and portrait on iOS

src/video/uikit/SDL_uikitvideo.m

@@ -204,7 +204,8 @@ UIKit_ComputeViewFrame(SDL_Window *window, UIScreen *screen)
      * https://bugzilla.libsdl.org/show_bug.cgi?id=3465
      * https://forums.developer.apple.com/thread/65337 */
     UIInterfaceOrientation orient = [UIApplication sharedApplication].statusBarOrientation;
-    BOOL landscape = UIInterfaceOrientationIsLandscape(orient);
+    BOOL landscape = UIInterfaceOrientationIsLandscape(orient) ||
+                    !(UIKit_GetSupportedOrientations(window) & (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown));
     BOOL fullscreen = CGRectEqualToRect(screen.bounds, frame);
 
     /* The orientation flip doesn't make sense when the window is smaller