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Description of problem:
With NetworkManager-libreswan-gnome installed, it is not possible to change advanced properties. The new dialog window is shown (IPsec Advanced Options), it looks like an active one, but nothing can be changed in it, until parent window (connection details dialog) is not closed. The advanced dialog can not even be closed before parent window is. 

Version-Release number of selected component (if applicable):
gnome-control-center-3.28.2-4.el8.x86_64
NetworkManager-libreswan-gnome-1.2.10-3.el8.x86_64

How reproducible:
Always

Steps to Reproduce:
1. install NetworkManager-libreswan-gnome
2. add or modify "IPsec based VPN" connection via gnome-control-center (Network tab)
3. click on "Advanced" button in "Identity" tab, advanced dialog pops-up

Actual results:
advanced dialog is uneditable

Expected results:
advanced dialog should be editable

Additional info:
When adding a new connection with nm-connection-editor, advanced dialog is editable.

Issue seems due to bug #1697329.
Closing as duplicate.

*** This bug has been marked as a duplicate of bug 1697329 ***