damage_report may be invoked multiple times before xwl_window_post_damage
in rootful mode. Ensure that the window is only added to the list if it's not
already added to avoid list corruption leading to infinite loop in
xwl_screen_post_damage.
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damage_report may be invoked multiple times before xwl_window_post_damage
in rootful mode. Ensure that the window is only added to the list if it's not
already added to avoid list corruption leading to infinite loop in
xwl_screen_post_damage.