[ERROR] Only either css files or gss files are supported on one interface

Why does GSS throw the following error when combining CSS and GSS files? (latest GWT 2.7 version)

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        [ERROR] Only either css files or gss files are supported on one interface 

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Why isn't it allowed to combine them ?

Combining it makes it much more friendly/easy to switch to GSS.

In my case it's a blocker to move to GSS. In my general components, that have their own resource bundle, I use adapter/empty css files that only contains the class names without any css rules. They are very handy to use and overcomes to having to add all class names to a css file.

They are empty so I don't see any problem that GSS can't process them.

Currently it's impossible to rename all the css files in general components to gss.

How to solve this ? Can't GSS not process CSS files as welll?

    

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