+ native classes
+ tracked properties
- Ember.Object
- Ember.Evented
- observers
- mixins
- computed/discourseComputed
Also removes unused wizard infrastructure for warnings. It appears
that once upon on time, either the server can generate warnings,
or some client code can generate them, which requires an extra
confirmation from the user before they can continue to the next step.
This code is not tested and appears unused and defunct. Nothing
generates such warning and the server does not serialize them.
Extracted from https://github.com/discourse/discourse/pull/23678
]When changing fonts in the `/wizard/steps/styling` step of
the wizard, users would not see the font loaded straight away,
having to switch to another one then back to the original to
see the result. This is because we are using canvas to render
the style preview and this fails with a Chrome-based intervention
when font loading is taking too long:
> [Intervention] Slow network is detected. See
https://www.chromestatus.com/feature/5636954674692096 for more details.
Fallback font will be used while loading:
https://sea2.discourse-cdn.com/business7/fonts/Roboto-Bold.ttf?v=0.0.9
We can get around this by manually loading the fonts selected using
the FontFace JS API when the user selects them and before rerendering
the canvas. This just requires preloading more information about the
fonts if the user is admin so the wizard can query this data.
