[Bug] Weird white window without any content **xwayland**

[feikedonia]

I've installed COSMIC on my EndeavourOS-KDE system, so I start COSMIC via SDDM.

When I log in to COSMIC two windows span: the Endeavour Welcome app and a small white square, without any contents.

I have no idea which program has span this square, so I don't know where to report this.

I have used the xprop command to find more information dough.

given the "Gtk application ID: org.kde.xwaylandvideobrigde" this may be not at all related to COSMIC.

Two windows span, the third window is the xprop-readout

`$ xprop
_VARIABLE_REFRESH(CARDINAL) = 1
WM_STATE(WM_STATE):
window state: Normal
icon window: 0x0
_NET_WM_STATE(ATOM) = _NET_WM_STATE_FOCUSED
_NET_WM_WINDOW_OPACITY(CARDINAL) = 0
_GTK_FRAME_EXTENTS(CARDINAL) = 99, 0, 99, 0
_NET_WM_ICON(CARDINAL) = Icon (128 x 128):
(not shown)

XdndAware(ATOM) = BITMAP
WM_NAME(STRING) = "Wayland naar X-opname-bridge"
_NET_WM_NAME(UTF8_STRING) = "Wayland naar X-opname-bridge — Xwayland video-bridge"
_MOTIF_WM_HINTS(_MOTIF_WM_HINTS) = 0x2, 0x0, 0x0, 0x0, 0x0
_NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_NORMAL
_XEMBED_INFO(_XEMBED_INFO) = 0x0, 0x1
WM_CLIENT_LEADER(WINDOW): window id # 0x40000a
WM_HINTS(WM_HINTS):
Client accepts input or input focus: False
window id # of group leader: 0x40000a
WM_CLIENT_MACHINE(STRING) = "vivobook"
_NET_WM_PID(CARDINAL) = 3255
_NET_WM_SYNC_REQUEST_COUNTER(CARDINAL) = 4194313
_GTK_APPLICATION_ID(UTF8_STRING) = "org.kde.xwaylandvideobridge"
_KDE_NET_WM_DESKTOP_FILE(UTF8_STRING) = "org.kde.xwaylandvideobridge"
WM_CLASS(STRING) = "xwaylandvideobridge", "xwaylandvideobridge"
WM_PROTOCOLS(ATOM): protocols WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING, _NET_WM_SYNC_REQUEST
WM_NORMAL_HINTS(WM_SIZE_HINTS):
user specified location: -99, 0
user specified size: 100 by 100
window gravity: Static`

[feikedonia]

Likely not reproducibly

[feikedonia]

I don't understand what this is, probably a combination between a EndeavourOS problem and a Cosmic Xwayland problem.