Prevent mouse movement events from being queued in loading screens (bug #4374)

CHANGELOG.md

@@ -15,6 +15,7 @@
     Bug #3905: Great House Dagoth issues
     Bug #4203: Resurrecting an actor doesn't close the loot GUI
     Bug #4227: Spellcasting restrictions are checked before spellcasting animations are played
+    Bug #4374: Player rotation reset when nearing area that hasn't been loaded yet
     Bug #4376: Moved actors don't respawn in their original cells
     Bug #4389: NPC's lips do not move if his head model has the NiBSAnimationNode root node
     Bug #4602: Robert's Bodies: crash inside createInstance()

components/sdlutil/sdlinputwrapper.cpp

@@ -52,13 +52,15 @@ 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
+            // During loading, handle window events, discard button presses and mouse movement 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);
+            SDL_FlushEvent(SDL_MOUSEMOTION);
+            SDL_FlushEvent(SDL_MOUSEWHEEL);
 
             return;
         }