Latest tech news from the Wikimedia technical community. Please tell other users about these changes. Not all changes will affect you. Translations are available.
Sites with a wikimedia.org address were by mistake redirected to the Wikimedia Foundation wiki on 26 January. This included Meta and Wikimedia Commons. The mistake was fixed after an hour. 
Some users had problems logging in and out around 22 January. Bots also had problems and edit previews did not work properly. This was because of problems related to the new component SessionManager. It was undone on 23 January. 
Because of new problems with SessionManager the latest version of MediaWiki was removed from the Wikimedia wikis again on 31 January. The new version this week will be without SessionManager. 
Changes this week
The page history will get a help link. This will go to Help:Page history on Meta. Wikis can exchange it for a link to their local pages. 
Notifications will only show part of a page name if it is very long. You will also have another way to mark notifications as read. 
The Universal Language Selector input methods are now available with the visual editor. This means many who write in non-Latin scripts can now use the visual editor. 
The visual editor will now give you more tools to edit tables. You can move rows and columns in a table and copy parts of tables to make new ones. You can also copy and paste more than one cell at the same time. 
The visual editor has a new warning message when you leave a page you are editing without saving. Non-English wikis might need to translate it. 
The new version of MediaWiki will be on test wikis and MediaWiki.org from 2 February. It will be on non-Wikipedia wikis and some Wikipedias from 3 February. It will be on all wikis from 4 February (calendar).
You can join the next meeting with the VisualEditor team. During the meeting, you can tell developers which bugs you think are the most important. The meeting will be on 2 February at 20:00 (UTC). See how to join.
When you get a notification that an edit has been reverted, the notification now quotes part of the edit summary. 
RESTBase is now using scrub_wikitext instead of scrubWikitext. 
Changes this week
Wikidata will have a new data type called "math". It will be used for formulas. 
The new version of MediaWiki will be on test wikis and MediaWiki.org from 9 February. It will be on non-Wikipedia wikis and some Wikipedias from 10 February. It will be on all wikis from 11 February (calendar).
You can join the next meeting with the VisualEditor team. During the meeting, you can tell developers which bugs you think are the most important. The meeting will be on 9 February at 20:00 (UTC). See how to join.
Other sites will be able to tell when visitors come from links on Wikipedia and other Wikimedia sites. They used to be able to do this until we started using forced HTTPS in June 2015. This is planned to happen on 15 February. 
Wikidata will have a new data type called "external-id". It will be used for references to external resources. It will be enabled on February 16. Some properties will be changed to the new data type.