semi [he/him]

The mirrorlist is a configuration file listing servers that updates can get pulled in from.

When a package update is installed that contains a configuration file, it will not overwrite the old file but be installed with a pacnew extension so that you can merge the files (like you did). It will keep complaining at you until you remove the pacnew file, which is fine to do after you have merged successfully.

The graphical issues are probably due to something else that happened during the update.

The pre mixed spices list their contents and it’s not that hard to come up with something similar by just using the individual ingredients.