Created attachment 39683 [details] [review]
proposed patch

Hmm. the documentation at least should mention that invisible text and
placeholders for images and child widgets are omitted. Maybe refer to
gtk_text_buffer_get_text() for details. It is unfortunate that
we can't guarantee that 

g_object_get (buffer, "text", text, NULL);
g_object_set (buffer, "text", text, NULL);

is a noop

Created attachment 39690 [details] [review]
v2: updated comment

Sorry to appear pedantic, but the PROP_TEXT is at the wrong spot in the enum
declaration, its under the /* Construct */ comment, but not a construct property.

And you should add a g_object_notify() call in the setter.

After doing these changes, feel free to commit.

Checking in ChangeLog;
/cvs/gnome/gtk+/ChangeLog,v  <--  ChangeLog
new revision: 1.6499; previous revision: 1.6498
done
Checking in gtk/gtktextbuffer.c;
/cvs/gnome/gtk+/gtk/gtktextbuffer.c,v  <--  gtktextbuffer.c
new revision: 1.101; previous revision: 1.100
done