When starting/stoping a progress step with a different source, the progress tree might get broken

The current situation is the following:

• start level 1 (source "source")
• start step 1.1 (source "source")
• start step 1.2 (source "source")
  • start step with source "othersource"
  • stop step with source "othersource"

-> the current level remain "othersource" level instead of going back to level "source"

This mean that when you start step 1.3 it will be a child of 1.2 instead of a sibling.