Sublime Text won't automatically change code, when I switched to different branch

问题

Lately, I'm learning GitHub, in the tutorial videos they used Eclipse for editing the project/repository. In that vid I saw the code changed when he switch to another branch.

I'm currently using Sublime Text 2 and can't get the same behavior, is there anyway to make Sublime Text 2 behave like Eclipse?

Here is my Preferences -> Settings-User:

{
    "font_size": 12
}

来源：https://stackoverflow.com/questions/24412876/sublime-text-wont-automatically-change-code-when-i-switched-to-different-branc