After I installed yay plasma5-applets-todolist, I could not get it to work, because the plasmoid reported the following error:
file:///usr/share/plasma/plasmoids/com.github.zren.todolist/contents/ui/main.qml:9:2: Type NoteItem unavailable
file:///usr/share/plasma/plasmoids/com.github.zren.todolist/contents/ui/NoteItem.qml:3:1: module "org.kde.plasma.private.notes" is not installed
Since it says it relies on the Sticky Notes plasmoid, to fix it, I went and did yay plasma-meta. This did pull in the Sticky Notes plasmoid too, but the issue with the ToDo List plasmoid persisted …what’s more even the Sticky Notes plasmoid shows the following error:
file:///usr/share/plasma/plasmoids/org.kde.plasma.notes/contents/ui/main.qml:27:1: module "org.kde.plasma.private.notes" is not installed
This is a fresh install (as of last week) and I have not messed around too much yet. (I did manage to remove my normal user from all groups, but this should be fixed now, and does not sound relevant really.)