sim: fakes: Allow to use leds.update from separate thread

sim/fakes/_sim.py

@@ -83,6 +83,8 @@ class Input:
         if ev.type == pygame.QUIT:
             pygame.quit()
             sys.exit()
+        if ev.type == pygame.USEREVENT:
+            _sim.render_gui_lazy()
 
         if prev_hover != self._mouse_hover:
             return True

sim/fakes/leds.py

@@ -43,7 +43,7 @@ def set_slew_rate(b: int):
 
 def update():
     _sim.leds_update()
-    _sim.render_gui_lazy()
+    pygame.event.post(pygame.event.Event(pygame.USEREVENT, {}))
 
 
 def set_auto_update(b: int):