Neither qt5-webchannel or qt5-webengine are currently in Manjaro repositories. Both have been deprecated and finally dropped to the AUR.
It is suggested to remove both.
If you have an AUR sourced application that depends on these, first try to re-build the application(s) concerned.
pamac likely attempted to re-build an application that depended on these packages, during the update, which means they would have needed to be built from source – thus the unusually long time taken.
Difficulties relating to AUR software can typically be minimised by adopting a strategy of separation between software sources.
Let me explain:
Ideally, updates from the official Manjaro repositories should be processed first (on their own) before any foreign sources (such as the AUR).
1. Update packages from the Manjaro repo(s):
sudo pacman -Syupamac update --no-aur(using pamac)
2. Build/update software sourced via the AUR:
pamac update --aur
3. If you use flatpak containerised apps:
flatpak update
The important factor is to maintain separation between updating from the Manjaro repos, the AUR or any other foreign sources.
This is especially important at times of large updates, where AUR software can potentionally delay the overall process considerably due building dependencies from source.
Only for a while – X11 will ultimately be removed completely from KDE.
See: Known Issues and Solutions:
Regards.