[Theme extender] Ability to override core LESS files

[SychO9]

When designing a flarum theme, any Less/CSS code you write needs to override any default styles present in core, that means you constantly have to over-specify elements, using !important also becomes necessary at times. An optimal solution would be to be able to tell the software: here is a (for example) DiscussionListItem.less file that overrides the default, the software would then not load the default and instead load the custom one.

There might be something that allows us to hook into the import process of Less files, an import_callback option, we'd have to pass that to the Less_Parser object instantiation here.

This should be a method within a Theme extender.

[iamdarkle]

@SychO9 I know it's a bit off topic, but until this is implemented is there a way to overwrite without constantly abusing !important?

[SychO9]

Well, you either overspecify, or use the important rule, or both, that's really all you can do.