Fixed crash when creating a dummy window on Mac OS X

src/video/SDL_video.c

@@ -1164,35 +1164,38 @@ SDL_UpdateFullscreenMode(SDL_Window * window, SDL_bool fullscreen)
     CHECK_WINDOW_MAGIC(window,-1);
 
     /* if we are in the process of hiding don't go back to fullscreen */
-    if ( window->is_hiding && fullscreen )
+    if (window->is_hiding && fullscreen) {
         return 0;
+    }
 
 #ifdef __MACOSX__
     /* if the window is going away and no resolution change is necessary,
-     do nothing, or else we may trigger an ugly double-transition
+       do nothing, or else we may trigger an ugly double-transition
      */
     if (window->is_destroying && (window->last_fullscreen_flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN_DESKTOP)
         return 0;
     
-    /* If we're switching between a fullscreen Space and "normal" fullscreen, we need to get back to normal first. */
-    if (fullscreen && ((window->last_fullscreen_flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN_DESKTOP) && ((window->flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN)) {
-        if (!Cocoa_SetWindowFullscreenSpace(window, SDL_FALSE)) {
-            return -1;
-        }
-    } else if (fullscreen && ((window->last_fullscreen_flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN) && ((window->flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN_DESKTOP)) {
-        display = SDL_GetDisplayForWindow(window);
-        SDL_SetDisplayModeForDisplay(display, NULL);
-        if (_this->SetWindowFullscreen) {
-            _this->SetWindowFullscreen(_this, window, display, SDL_FALSE);
+    if (SDL_strcmp(_this->name, "dummy") != 0) {
+        /* If we're switching between a fullscreen Space and "normal" fullscreen, we need to get back to normal first. */
+        if (fullscreen && ((window->last_fullscreen_flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN_DESKTOP) && ((window->flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN)) {
+            if (!Cocoa_SetWindowFullscreenSpace(window, SDL_FALSE)) {
+                return -1;
+            }
+        } else if (fullscreen && ((window->last_fullscreen_flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN) && ((window->flags & FULLSCREEN_MASK) == SDL_WINDOW_FULLSCREEN_DESKTOP)) {
+            display = SDL_GetDisplayForWindow(window);
+            SDL_SetDisplayModeForDisplay(display, NULL);
+            if (_this->SetWindowFullscreen) {
+                _this->SetWindowFullscreen(_this, window, display, SDL_FALSE);
+            }
         }
-    }
 
-    if (Cocoa_SetWindowFullscreenSpace(window, fullscreen)) {
-        if (Cocoa_IsWindowInFullscreenSpace(window) != fullscreen) {
-            return -1;
+        if (Cocoa_SetWindowFullscreenSpace(window, fullscreen)) {
+            if (Cocoa_IsWindowInFullscreenSpace(window) != fullscreen) {
+                return -1;
+            }
+            window->last_fullscreen_flags = window->flags;
+            return 0;
         }
-        window->last_fullscreen_flags = window->flags;
-        return 0;
     }
 #elif __WINRT__ && (NTDDI_VERSION < NTDDI_WIN10)
     /* HACK: WinRT 8.x apps can't choose whether or not they are fullscreen
@@ -1345,7 +1348,7 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
         }
     }
 
-    if ( (((flags & SDL_WINDOW_UTILITY) != 0) + ((flags & SDL_WINDOW_TOOLTIP) != 0) + ((flags & SDL_WINDOW_POPUP_MENU) != 0)) > 1 ) {
+    if ((((flags & SDL_WINDOW_UTILITY) != 0) + ((flags & SDL_WINDOW_TOOLTIP) != 0) + ((flags & SDL_WINDOW_POPUP_MENU) != 0)) > 1) {
         SDL_SetError("Conflicting window flags specified");
         return NULL;
     }
@@ -3790,7 +3793,7 @@ SDL_SetWindowHitTest(SDL_Window * window, SDL_HitTest callback, void *userdata)
 float SDL_ComputeDiagonalDPI(int hpix, int vpix, float hinches, float vinches)
 {
 	float den2 = hinches * hinches + vinches * vinches;
-	if ( den2 <= 0.0f ) {
+	if (den2 <= 0.0f) {
 		return 0.0f;
 	}