The ::insert-pixbuf signal is emitted to insert a gdk.Pixbuf
in a gtk.TextBuffer Insertion actually occurs in the default handler.
Note that if your handler runs before the default handler it must not
invalidate the location iter (or has to revalidate it).
The default signal handler revalidates it to be placed after the
inserted pixbuf.
The ::insert-pixbuf signal is emitted to insert a gdk.Pixbuf in a gtk.TextBuffer Insertion actually occurs in the default handler.
Note that if your handler runs before the default handler it must not invalidate the location iter (or has to revalidate it). The default signal handler revalidates it to be placed after the inserted pixbuf.
See also: TextBuffer.insertPixbuf.