Visual Studio 2015 new files not being added to source control automatically

Question

I have just upgraded to VS2015 and I am experiencing an issue I have not seen before. Using an existing solution under source control, I am able to modify files and they get

Answer 1

We have the same issue because of a branch called 'Release'. But the issue is only at Visual Studio 2015 Update 3. Using Visual Studio 2015 Update 2, everything is ok. So Visual Studio Update 3 must have been changed its behaviour. It would be useful to return to its old behaviour.