Ideally we would have the BundlesManager load the bundles but since tests don’t have their own framework requirements, this would require that the layout framework is setup to depend on the BundlesManager framework.
Since styles_for_scope effectively ignore the font parameters (and instead return styles based on the font parameters used when the cache entry was created) it is a better design to have theme_t own the font. This way, changing it can do the proper cache invalidation.
A minor downside is that we can now change the font of the theme without also changing the layout’s font, which wouldn’t cause proper layout invalidation — since layout_t owns theme_t though, users of a layout should always change font via layout_t (which will then change it in the theme).
Also, themes cannot be shared between views that wish to use different font settings.
Given constraint-based layouts, we’re more likely to create views in code, and as helper functions are often involved, it makes sense to name them so that we can quickly get a list of all helpers (via search), either for copy/paste or for evaluating wether or not it makes sense to move all helpers to a single library.
Since helpers are declared with static storage, they do not pollute the global namespace.
