Description of problem:
0.11.11-7
- Add support for "scroll-up" and "scroll-down" control 
  sequences to make vte more xterm compatible (Patch
  from Nalin, #128375)
0.11.11-8
- Commit patch from Owen to avoid scrolling invalid regions.

One of these two changes causes gnome-terminal to fail to render stuff
when doing various operations in bash.  Various behaviors are readily
apparent, although not all occuring at the same time:

* All bash prompts scrolled up above the current prompt are replaced
by a black cursor-looking character.
* Seemingly random text that has scrolled past does not render.
* Sometimes the prompt or current line does not render.

Unable to take a screenshot of this since ALT-TAB or screenshot seems
to cause a redraw, fixing the current screen output.  Further activity
however immediately causes more corruption.