Note that it is possible, albeit rather clunky and laborious, to move an existing category to the end, by typing some of its name in to the "add category" option and then selecting "move category to end".

However, a proper category-reorderer system in the category editor is definitely something we should build; I'm enamoured of the idea of a drag-and-drop functionality for this, though happy to listen to alternative ideas.

Is this Gerrit change 173360 ?

(In reply to Alex Monk from comment #2)

Is this Gerrit change #173360 ?

Yes.

Change 173360 had a related patch set uploaded by Alex Monk:
[WIP] Make category widget items draggable

https://gerrit.wikimedia.org/r/173360

Checked in betalabs.