Break SDL_PeepEvents loop on error (bug #6890)

CHANGELOG.md

@@ -140,6 +140,7 @@
     Bug #6818: ess-importer doesn't exactly reproduce camera
     Bug #6849: ImageButton texture is not scaled properly
     Bug #6869: Hits queue stagger during swing animation
+    Bug #6890: SDL_PeepEvents errors are not handled
     Bug #6895: Removing a negative number of items from a script, makes the script terminate with an error
     Bug #6898: Accessing the Quick Inventory menu does not work while in menu mode
     Bug #6901: Morrowind.exe soul gem usage discrepancy

components/sdlutil/sdlinputwrapper.cpp

@@ -53,7 +53,7 @@ InputWrapper::InputWrapper(SDL_Window* window, osg::ref_ptr<osgViewer::Viewer> v
         if (windowEventsOnly)
         {
             // During loading, handle window events, discard button presses and keep others for later
-            while (SDL_PeepEvents(&evt, 1, SDL_GETEVENT, SDL_WINDOWEVENT, SDL_WINDOWEVENT))
+            while (SDL_PeepEvents(&evt, 1, SDL_GETEVENT, SDL_WINDOWEVENT, SDL_WINDOWEVENT) > 0)
                 handleWindowEvent(evt);
 
             SDL_FlushEvent(SDL_KEYDOWN);