[Xorg 1.18] Menu's not visible

[mdec]

Originally Posted by ColdFire

The Bug is in the X-Server - the same issue arises using other graphic drivers other multi-screen setups ...

I have too Xorg 1.18.0-2 installed on Fedora 23, but the context menus disappear only with displaylink devices.
I have an useless Dell D3100 dock now, and I'm forced to use Dell's USB-C to VGA adapter (code 470 ABNC) since, with it, I can use the external monitor and correctly see the context menus.
BTW, right-clicking on the Gnome desktop shows the menu in place, while right-clicking in application windows shows the menu in the notebook's built-in screen or outside the external screen, as a single thin light row in the upper left corner.

DLsupport tool logs attached. Let me know if I can further help with logs/settings/etc.

My setup:

Dell XPS-13 9350
Dell D3100 usb dock
Dell USB-C to VGA adapter (code 470 ABNC)
Nec Multisync EA261WM (HDMI to DVI cable)

Fedora 23
kernel 4.4.0 (required for the wireless adapter to work) compiled for Fedora 23
Xorg 1.18.0-2 (distribution's default)
DisplayLink driver 1.0.335