Returns all parts of a (possibly compound) language id.
languageIdParts('diff:django:css') returns ['diff', 'django', 'css'].
languageIdParts('diff:django:css')
['diff', 'django', 'css']
Returns all parts of a (possibly compound) language id.
languageIdParts('diff:django:css')returns['diff', 'django', 'css'].