Tabs at the beginning of lines in a paragraph don't display correctly

This only happens when you have your cursor at the beginning of lines that are not the first line in a paragraph.  When you press the tab key it seems like the model is getting changed but the UI doesn't get updated with the change.  Then if you edit anywhere in the first line of the paragraph you can see the tabs you entered appear.

Here is a video of what I am seeing in my application as well as the demo application http://screencast.com/t/NTViNjRhNzgt