Fix init_workspace for multiple sources

Raoul Hidalgo Charmanrequested to merge
raoul/440-fix into master

Description

Noticed a mistake that sneaked in for !1214 (merged), so only the last source of an element is placed in a workspace.

Changes proposed in this merge request:

  • Fix Element._open_workspace so all sources are initialised.
  • Add test that checks opening a workspace includes all sources.

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