Do you use a different application to open .c and .css files? That works
fine if you use the same application, you can use that as a workaround.
There is a bug upstream about it:
https://bugs.freedesktop.org/show_bug.cgi?id=9469
** Changed in: shared-mime-info (Ubuntu)
Status: Needs Info => Confirmed
** Bug watch added: Freedesktop Bugzilla #9469
https://bugs.freedesktop.org/show_bug.cgi?id=9469
** Also affects: shared-mime (upstream) via
https://bugs.freedesktop.org/show_bug.cgi?id=9469
Importance: Unknown
Status: Unknown
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Incorrect mimetype detection of CSS files that start with a comment
https://launchpad.net/bugs/82284
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