Note: this agitates T230232 again - when merging this please
make sure a merge for I929090848f3e04647a97f4979ec78682623fa070
is pending.
In various places we try to override the default mw-ui-icon behaviours
The hacks need to be removed as part of addressing the core problem.
Changes:
* Wherever we use mw-ui-icon-before in PHP - wrap the label with a span
so that label font-size is altered where needed - not the icon
* Where a small icon is needed us isSmall parameter for the Icon component
* Apply font-size to labels of mw-ui-icon-before elements
* The browser tests need a slight update to access the span element inside
a menu item - in the case of the logout button the label is always hidden,
so we need to check the visibility of the parent element (secondary_action)
Bug: T229440
Depends-On: I3f803ec4c9068b30aa93b803391aa4d65d8310ff
Change-Id: I07e4ae233979636b739f1117dd7703571e0a9366
