GitLab

Remove deprecated `background-image-svg()` mixin calls

Deprecated in MW 1.35 and to be removed in MW 1.36.
See https://phabricator.wikimedia.org/T248062 for more information.

Use hook to add body attributes

Reduce overspecified element

Avoid use of wfSetupSession()

Check for MagicWord::get() before using

This method has been removed in MediaWiki 1.35.

Also remove trailing spaces on lines in the Hooks class.

This global function has been hard deprecated  and is slated for removal in [T249082](https://phabricator.wikimedia.org/T249082)

See https://phabricator.wikimedia.org/T248137 for more information

Fix "count(): Parameter must be an array or an object that implements Countable"

allow hiding of navigational sections/elements for visitors who do not belong to any of the specified groups