What windows are "popup windows"?

[killermoehre]

Am 17.11.2015 um 19:19 schrieb John Found:
> In XFCE, compositing window manager, there is an option "Show shadows under popup windows".
> But what windows are considered "popup" in XFCE compositor?
>
> I have windows with override_redirect = 1, that are not decorated by the WM (as intended) but they
> never get shadows under. In addition I tried to set property _NET_WM_WINDOW_TYPE_POPUP_MENU, but
> with null result.
>
> Regards
>
The shadow is a property of the window decoration. No decoraton → no shadow.

Regards