ReSharper Error: "The output has reached the limit and was truncated. To view the full output use 'Show Stack Trace in a new window' action."

Question

When running unit tests in ReSharper, if the output is too long, it gives this error:

The output has reached the limit and was truncated. To view the full output use 'Show Stack Trace in a new window' action. 

Update

ReSharper fixed this issue in 2016.2, see answer from @Alexander Pacha.

Answer 1

It took a few minutes of hunting. Click on the icon in the task bar: