Emacs: Magit & putting a buffer under 2 different modes

gistfile1.txt

Some Emacs Notes after watching
http://www.youtube.com/watch?v=RvPFZL6NJNQ&list=PL4th0AZixyRE9bb8OevAb7I8RuaWJQWnO&index=7
https://gist.github.com/jwiegley/5277578:

- Magit: in the status buffer you can highlight just the portion of the chunk you want
  and stage only those lines in the index!

- Here is how to put a single buffer under 2 different modes:
  Example: you are editing HTML and have a snippet of Javascript that you want to 
  extend. The page is in HTML mode. Clone an indirect buffer. Narrow to region on the
  snippet you want to modify and put that in Javascript mode. Now anything you type will
  reflect in both the buffers. An indirect buffer is one where it share only the content
  with another buffer. All other variables like major mode, can be different.