Fix hint not clearing: InvalidateRect must request background erase (True) so the class brush repaints black

black_screen_dim.py

@@ -259,7 +259,7 @@ if sys.platform == "win32":
             _hint_active = False
             user32.KillTimer(hwnd, 1)
             for h in _hwnds:
-                user32.InvalidateRect(h, None, False)
+                user32.InvalidateRect(h, None, True)
             return 0
         if msg in (WM_DESTROY, WM_CLOSE):
             user32.PostQuitMessage(0)