* Revert "Fix header contents moving when opening modal (#2131)"
* Fix header contents moving when modal opened/closed.
Conditionally apply the navbar-fixed-top class only when needed, so that we can take advantage of it without always having the navbar in position:fixed, as was done in the previous solution. That resulted in a clash with custom headers.
* Show header on refresh of scrolled page
Due to some magic in Mithril 0.1's context:retain flag, some DOM elements were cached across page reloads. Since that has been eliminated, if we refresh the page and we are scrolled down, the "affix" class which makes the header fixed (and as a result, visible) isn't applied until the first scroll. We fix this by running ScrollListener.update() immediately to set initial navbar state.
Refactor Frontend + Asset code
- Use Laravel's Filesystem component for asset IO, meaning theoretically
assets should be storable on S3 etc.
- More reliable checking for asset recompilation when debug mode is on,
so you don't have to constantly delete the compiled assets to force
a recompile. Should also fix issues with locale JS files being
recompiled with the same name and cached.
- Remove JavaScript minification, because it will be done by Webpack
(exception is for the TextFormatter JS).
- Add support for JS sourcemaps.
- Separate frontend view and assets completely. This is an important
distinction because frontend assets are compiled independent of a
request, whereas putting together a view depends on a request.
- Bind frontend view/asset factory instances to the container (in
service providers) rather than subclassing. Asset and content
populators can be added to these factories – these are simply objects
that populate the asset compilers or the view with information.
- Add RouteHandlerFactory functions that make it easy to hook up a
frontend controller with a frontend instance ± some content.
- Remove the need for "nojs"
- Fix cache:clear command
- Recompile assets when settings/enabled extensions change
