* Introduce a generalized feature toggle system that uses user
preferences or localStorage for anons (right now the latter is out
of scope but will be explored in a follow up)
* Feature flagged to VisualEnhancementNext for now, given the dependency
on icon size
Bug: T319449
Change-Id: I7343a3f38b720411d5ef5f3414f25f475b0bb84a
Adds tests for the addPortletLinkHandler, which should
add an icon element to items added via 'mw.util.addPortletLink'
and conditionally move elements from the toolbar into
the more menu at narrow widths.
- Adds tests for dropdownMenu.js
- Adds associated Jest snapshots
- Stubs the mediawiki.page.ready module
- Updates mockMediawiki.js to 4.6.0
- Adds global mock for mw.util.showPortlet()
- Cleans up tests using local versions of these mocks
Bug: T314798
Change-Id: I81394d840321916756a41a23c40d96c4b6341931
