events: Update self-referential pointers when copying event objects

Pointers to static internal data need to be updated when copying events, or the cleanup code will attempt to free old stack data that went out of scope.

src/events/SDL_events.c

@@ -468,6 +468,18 @@ static void SDL_LogEvent(const SDL_Event *event)
 #undef uint
 }
 
+static void SDL_CopyEvent(SDL_Event *dst, SDL_Event *src)
+{
+    *dst = *src;
+
+    /* Pointers to internal static data must be updated when copying. */
+    if (src->type == SDL_EVENT_TEXT_EDITING && src->edit.text == src->edit.short_text) {
+        dst->edit.text = dst->edit.short_text;
+    } else if (src->type == SDL_EVENT_DROP_TEXT && src->drop.data == src->drop.short_data) {
+        dst->drop.data = dst->drop.short_data;
+    }
+}
+
 /* Public functions */
 
 void SDL_StopEventLoop(void)
@@ -597,7 +609,7 @@ static int SDL_AddEvent(SDL_Event *event)
         SDL_LogEvent(event);
     }
 
-    entry->event = *event;
+    SDL_CopyEvent(&entry->event, event);
     if (event->type == SDL_EVENT_POLL_SENTINEL) {
         SDL_AtomicAdd(&SDL_sentinel_pending, 1);
     }
@@ -706,7 +718,7 @@ static int SDL_PeepEventsInternal(SDL_Event *events, int numevents, SDL_eventact
                 type = entry->event.type;
                 if (minType <= type && type <= maxType) {
                     if (events) {
-                        events[used] = entry->event;
+                        SDL_CopyEvent(&events[used], &entry->event);
 
                         if (action == SDL_GETEVENT) {
                             SDL_CutEvent(entry);