Gets the parent section for the given @section. The parent section is
the section that contains this @section. A special case are sections of
type #GTK_CSS_SECTION_DOCUMENT. Their parent will either be %NULL
if they are the original CSS document that was loaded by
gtk_css_provider_load_from_file() or a section of type
#GTK_CSS_SECTION_IMPORT if it was loaded with an import rule from
a different file.
Gets the parent section for the given @section. The parent section is the section that contains this @section. A special case are sections of type #GTK_CSS_SECTION_DOCUMENT. Their parent will either be %NULL if they are the original CSS document that was loaded by gtk_css_provider_load_from_file() or a section of type #GTK_CSS_SECTION_IMPORT if it was loaded with an import rule from a different file.