The user preference to "Enable collapsing of items in the sidebar in Vector skin" has been killed and the collapsing is now forced on everyone (for reasons that I cannot begin to fathom).
Contrary to the idea (apparently) set forth in bug 23807, this needs to be restored to a user preference. If Vector is the default skin, we should allow people to configure it in their preferences (the normal place to configure things), not rely on users creating personal CSS or JS code to do it.
Version: 1.22.0
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=23807
https://bugzilla.wikimedia.org/show_bug.cgi?id=61143
https://bugzilla.wikimedia.org/show_bug.cgi?id=39035