Mothership wipes out changes from other instances of hook_css_alter()

The issue here is that drupal_add_css() is being used inside hook_css_alter(). This hook gets an array of CSS files that could have already been sent through this hook in other modules. In this case it's LESS. By using drupal_add_css() and having no way to pass the CSS array, it ends up getting reset to what it's in the static cache handled by the drupal_static() function. I've updated the issue title to reflect this.

I see two options. We can either stop using drupal_add_css() inside this hook, or we temporarily change the static cache while we are in this hook. I'm attaching a patch that does the latter. While I don't like the idea of messing with the static cache like this, it's better than doing something like making a virtual copy of the drupal_add_css() function for our own use.

Setting this to 'bug report'.

can you test it with the latest copy the css file removal code has been rewritten.

btw why dont you use a precompiler like less app / codekit etc ?