Colored bars have appeard in my Visual Studio 2012 beside the line numbers

Question

Today when I started Visual Studio 2012 at work I found some new colored bars.

We work on a shared remote server through RDP, so I asked around if someone has instal

Answer 1

They come from the GIT source control provider. I suppose your project is versioned, so those bars give you information about lines that are changed in some way, and what is the nature of the change.