GtkTextView - text justification

[Scott Dattalo <scott dattalo com>]

I have a gtk_text_view displaying the contents of a syntax-highlighted 
file.  I'd like to create a column along the left side of the buffer for 
holding icons that are dynamically drawn (these icons align with the 
rows of text). In addition, I'd like to retain the text justification of 
the text as the icons are created/destroyed. Is this possible?

The specific application is gpsim, the GNUPIC simulator 
(http://www.dattalo.com/gnupic/gpsim.html). I'm attempting to update the 
source browser window. This window displays the contents of an Assembly 
file. Breakpoints, current program counter and a few other miscellaneous 
items are indicated with icons along the left side of the window. In the 
past I've used a GtkLayout widget in conjunction with a GtkText widget 
to achieve this. However, the more modern GtkTextView widget is much 
more powerful and seems like it should be able to do this. So far, I've 
attempted to set the left margin with a gtk_text_tag, but this doesn't 
work when a GtkTextChildAnchor (the widget for wrapping GtkWidgets so 
that they can be displayed in a GtkTextBuffer) is placed at the 
beginning of a line. If anyone has suggestions I'd love to hear them!

Scott