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
CssProvider.loadFromFile 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 CssProvider.loadFromFile or a section of type GTK_CSS_SECTION_IMPORT if it was loaded with an import rule from a different file.