Handle window focus events when svid movie is playing

Source/movie.cpp

@@ -55,6 +55,23 @@ void play_movie(const char *pszMovie, bool userCanClose)
 					if (userCanClose || (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE))
 						movie_playing = false;
 					break;
+#ifndef USE_SDL1
+				case SDL_WINDOWEVENT:
+					if (event.window.event == SDL_WINDOWEVENT_FOCUS_LOST)
+						diablo_focus_pause();
+					else if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED)
+						diablo_focus_unpause();
+					break;
+#else
+				case SDL_ACTIVEEVENT:
+					if ((event.active.state & SDL_APPINPUTFOCUS) != 0) {
+						if (event.active.gain == 0)
+							diablo_focus_pause();
+						else
+							diablo_focus_unpause();
+					}
+					break;
+#endif
 				case SDL_QUIT:
 					SVidPlayEnd();
 					diablo_quit(0);