This is a convenience function which simply creates a child anchor
with [ctor@Gtk.TextChildAnchor.new] and inserts it into the buffer
with [method@Gtk.TextBuffer.insert_child_anchor].
The new anchor is owned by the buffer; no reference count is
returned to the caller of this function.
Creates and inserts a child anchor.
This is a convenience function which simply creates a child anchor with [ctor@Gtk.TextChildAnchor.new] and inserts it into the buffer with [method@Gtk.TextBuffer.insert_child_anchor].
The new anchor is owned by the buffer; no reference count is returned to the caller of this function.