Comment 6 for bug 1825741

Description:
We have double menus in GTK3 VCL, if it is used with Unity-style globalmenu - vala-panel-appmenu, or with GTK3 Backend on KDE (via https://github.com/KDE/plasma-workspace/tree/master/gmenu-dbusmenu-proxy)

Package version: 6.2.2-2
Distribution: ArchLinux.

Steps to Reproduce:
1. Install and configure vala-panel-appmenu (https://gitlab.com/vala-panel-project/vala-panel-appmenu)
2. Open any LibreOffice app
3. Bug happens))))

Actual Results:
We see double menus, as in screenshots in bug on vala-panel-appmenu GitLab (https://gitlab.com/vala-panel-project/vala-panel-appmenu/issues/286)

Expected Results:
We should see only single menu, no double menus.

Reproducible: Always

User Profile Reset: Yes

Additional Info:
Related to:

1. https://bugs.documentfoundation.org/show_bug.cgi?id=123416 - similar (now seems fixed) bug for KDE on 6.2.0 and Qt VCL

2. https://bugs.documentfoundation.org/show_bug.cgi?id=122619 - this bug calls to remove menu export in GTK3 at all, because it is rarely needed. I am strongly against this decision.

3. https://gitlab.com/vala-panel-project/vala-panel-appmenu/issues/286 - Issue on vala-panel-appmenu end, confirmed by me and by some of my users.