Represents all currently active stock-sections associated with
the processing of this template. That is:
stockSections[0]
- The current stock-section (same as
stockSection
property)
stockSections[1]
- The stock-section from where the current one has been started (if there was any)
stockSections[2]
- The parent of the parent
...
- so on
Note, this property makes sense only within some stock-section,
otherwise it just returns an empty array.