new css indenter

[sabof]

I have created a new css indenter in es-css-mode, which correctly indents comments and multiline colon statements.

Have a look, and tell me if there are any issues. Later, I will add it to melpa, and you might want to inherit from that, instead of the built-in mode. If I'm not mistaken there is a way to specify dependencies, so they get downloaded automatically.

https://github.com/sabof/es-css-mode
https://github.com/sabof/es-lib

[antonj]

In what way does it indent CSS more correctly than the builtin mode?