Whoops, it's not quite that easy - fixed bug in SDL_ClearDirtyRects()

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402586

src/video/SDL_rect.c

@@ -149,7 +149,20 @@ SDL_AddDirtyRect(SDL_DirtyRectList * list, const SDL_Rect * rect)
 void
 SDL_ClearDirtyRects(SDL_DirtyRectList * list)
 {
-    list->free = list->list;
+    SDL_DirtyRect *prev, *curr;
+
+    /* Skip to the end of the free list */
+    prev = NULL;
+    for (curr = list->free; curr; curr = curr->next) {
+        prev = curr;
+    }
+
+    /* Add the list entries to the end */
+    if (prev) {
+        prev->next = list->list;
+    } else {
+        list->free = list->list;
+    }
     list->list = NULL;
     list->count = 0;
 }