Returns whether @sibling is one of @renderer’s focus siblings (see gtk_cell_area_add_focus_sibling()).
the #GtkCellRenderer expected to have focus
the #GtkCellRenderer to check against @renderer’s sibling list
%TRUE if @sibling is a focus sibling of @renderer
3.0
See Implementation
Returns whether @sibling is one of @renderer’s focus siblings (see gtk_cell_area_add_focus_sibling()).