As you can read here, version 20230827-2 of the archlinux-appstream-data package was only just adopted from Arch into Manjaro Unstable on 2023.08.27, and then from there made its way into Manjaro Testing yesterday (2023.08.28).
Now, today (2023.08.29), there is apparently a Stable Update without a Stable Updates announcement thread. In and of itself, this is not such a worrisome event, given that the announcement threads may always be posted with a few hours of delay if this is more convenient for the developers, who are also only human.
However, according to the news section in octopi on the Stable branch, today’s Stable update would actually be a Testing Update. And this does indeed appear to unfortunately be the case, given that the problematic 20230827-2 version of the archlinux-appstream-data package — which causes a problem with both pamac-gtk3 and pamac-gtk — is part of this update.
If this archlinux-appstream-data package is the only one causing problems — probably not, but okay — then I would propose that people would temporarily add it to IgnorePkg in /etc/pacman.confbefore updating, and that those who updated their systems before noticing the problem would downgrade to version 20230827-1 of the package again if they still have it in their package cache.
However, if possible, I would recommend simply pulling this update from the Stable branch again and rolling back to the previous content of the main Stable repo. It will then of course take quite a bit of time before all of the mirrors have synced again, but it would save a lot of people from unnecessary headaches — and especially so the ones who use the pamac GUI.
I’ve updated just now, about 45 minutes ago, and everything seems to be working fine.
The KDE developers have also finally cleaned up a longstanding idiocy in dolphin, i.e. ever since about five years ago, dolphin has always shown an expand/collapse indicator in front of the folders in the side bar, whether these folders had subfolders or not. This is gone now, and only the folders with subfolders now have such an indicator for expanding the view.
The bug with one core always showing 100% due to mariadb is gone too now.