It definitely has been changed (on my system) by the update I run today (where btw. baselayout was updated from 1.8.0-64-1-x86_64 to 1.8.0-67-1-x86_64).

$ cat trigger.odf
<iframe src='macro:Shell("firefox")'></iframe>

In my case that wasn't a new file but one that existed (and worked) before Budgie Desktop View.

I've had similar issues when installing Solus on one of my machines a few months ago. With a wired connection instead of Wifi but, as confirmed on IRC, the cause was the same:
The installer names the machine solus but later the local DHCP server suggest another name. Unfortunately the installer's DHCP client accepts that name (and renames the host).
But as the magic cookie is linked to the hostname, renaming the machine prevents starting a new graphical windows. Already running ones are not affected.

I think I only mentioned it to TraceyC on IRC, so I put it here as well: hplip-3.20.9 does work on Gentoo Linux.

I did what TraceyC suggested and installed older versions of hplip: