Second copy of datasource fails on reload of workflow
If there are 2 copies of an eml datasource in a workflow, then one will fail to
open (stays red) when a saved version of the workflow is re-opened.
#2 Updated by Jing Tao about 15 years ago
Since in data cache system, one same data entity will have same thread to
download it. If one workflow have two same data source actors, this will cause
problem. We add new boolean flag in system to make sure the downloading will be
finished one by one. This bug has been fixed.