Returns %TRUE if @node is an ancestor of @descendant. This is true if node is the parent of @descendant, or if node is the grandparent of @descendant etc.
a #GNode
%TRUE if @node is an ancestor of @descendant
See Implementation
Returns %TRUE if @node is an ancestor of @descendant. This is true if node is the parent of @descendant, or if node is the grandparent of @descendant etc.