Steps to reproduce
- Go in watchlist
- Edit raw watchlist with removing >100 items there
If it is done successfully it should show it with https://translatewiki.net/wiki/MediaWiki:Watchlistedit-too-many/en message too. It should be something like this:
"Watchlist is edited successfully, but there are too many pages to list here."
It shows There are too many pages to display here. only and user no knows is it done or not.