Can a pixbuf inserted into a GTK+ text buffer be set as “floating”?

Question

I'm writing an application [a Pidgin plugin, actually], which inserts an image embedded into a GtkTextBuffer. Currently, I add it using:

gtk_text_buffer_insert_pixbuf(textBuffer, &iter, pixbuf);

However, this just puts the image "inline" with the text. What I'm looking for for is something similar to HTML's "float". For example, assuming my image is about twice the size of a line of text, I current get this [where X is the image]

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam gravida

XXXX
XXXX ante in massa dignissim aliquam. Nullam tempus quam luctus eros volutpat laoreet. 

XXXX
XXXX sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.
Mauris semper, nunc quis gravida molestie,

leo neque imperdiet nulla, vel consectetur nisi nisl non metus. Maecenas pharetra
magna nec magna mattis faucibus convallis nibh  

Ideally, I'd like to have:

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam gravida

XXXX ante in massa dignissim aliquam. Nullam tempus quam luctus eros volutpat laoreet.
XXXX

XXXX sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.
XXXX Mauris semper, nunc quis gravida molestie,

leo neque imperdiet nulla, vel consectetur nisi nisl non metus. Maecenas pharetra
magna nec magna mattis faucibus convallis nibh 

Note that there are four paragraphs, where the second and third have an image in the beginning.

Is this possible?