Recently I was in a particular debugging situation where the process that was debugged by Visual Studio was launching another process, and I needed to debug the startup of this second process too (no way to attach to the process from the IDE, then).
I have found that the solution is to call:
Visual Studio 2015 didn't allow SharePoint 2013/2016 WFM (Workflow Manager) development, so far.
The problem is because installing .NET 4.6 was breaking Service Bus 1.1
There is a patch fixing it: Update for Service Bus Server 1.1 (KB3086798)