RFE: please add themes to virt-viewer's preferences

Fedora 35 virt-viewer-10.0-4.fc35.x86_64 Companion bug on Fedora BugZilla (same title): https://bugzilla.redhat.com/show_bug.cgi?id=2028680

As of Fedora 35, virt-viewer now defaults to a "dark" theme. This is a pain in the neck (not my exact word) as it makes so I can not tell the edges of my virt-viewer window and have actually shutdown my host a few times by accident.

This is my workaround:

bash -c "GTK_THEME=Adwaita:light remote-viewer spice://127.0.0.1:5905"

In virt-viewer's decorations, there is a preferences option (hamburger). Would you please add at least the following three theme choices:

Dark Light System

Please make the default "System".

And yes, I know developers like dark themes as light attracts bugs, but the rest of us have to use it.

Many thanks, -T