When having multiple visual studio instances open at the same time, one instance will get the settings of the other instance, which of course is wrong.

Reproduction steps

1. Open a solution with visual studio 2015 that has a Rebracer.xml. Everything is fine. Formatting works like it should, according to the Rebracer.xml.
2. Open a second different solution (ideally from some other repository) with a different Rebracer.xml. Make sure the programming language in this solution is the same as in the previous solution. Formatting works like it should in this solution.
3. Now switch back to the first solution, and issue a formatting command. The formatting rules of the second solution will be used!
4. Press ctrl-shift-s in the first solution (i.e. save all) and close it. Look at the changes in the repository of the first solution. The formatting rules in Rebracer.xml will be changed.