In windowed mode artifacts are left on the desktop when the window is moved or when another window is placed on top of it.

Description

In windowed mode artifacts are left on the desktop when the window is moved or when another window is placed on top of it.
Disable direct updating for the DirectX windowed driver by using the dedicated configuration variable. See the 'Configuration routines' section in the docs and the allegro.cfg template file for more detailed informations.