Discard button press events during save loading (bug #5619)

CHANGELOG.md

@@ -80,6 +80,7 @@
     Bug #5603: Setting constant effect cast style doesn't correct effects view
     Bug #5604: Only one valid NIF root node is loaded from a single file
     Bug #5611: Usable items with "0 Uses" should be used only once
+    Bug #5619: Input events are queued during save loading
     Bug #5622: Can't properly interact with the console when in pause menu
     Bug #5627: Bookart not shown if it isn't followed by <BR> statement
     Bug #5633: Damage Spells in effect before god mode is enabled continue to hurt the player character and can kill them

components/sdlutil/sdlinputwrapper.cpp

@@ -52,9 +52,14 @@ InputWrapper::InputWrapper(SDL_Window* window, osg::ref_ptr<osgViewer::Viewer> v
 
         if (windowEventsOnly)
         {
-            // During loading, just handle window events, and keep others for later
+            // During loading, handle window events, discard button presses and keep others for later
             while (SDL_PeepEvents(&evt, 1, SDL_GETEVENT, SDL_WINDOWEVENT, SDL_WINDOWEVENT))
                 handleWindowEvent(evt);
+
+            SDL_FlushEvent(SDL_KEYDOWN);
+            SDL_FlushEvent(SDL_CONTROLLERBUTTONDOWN);
+            SDL_FlushEvent(SDL_MOUSEBUTTONDOWN);
+
             return;
         }