Summary:
While switching the destination site in the Duplicate Document dialog, there
were times when it was saveable even though destination workspaces were still
being fetched. This sometimes causes a test failure, with the document getting
saved to a workspace from the previously-selected org.
Test Plan:
Tested manually; reproduced by adding a conditional artificial delay
in _updateWorkspaces helper.
Reviewers: paulfitz, georgegevoian
Reviewed By: paulfitz, georgegevoian
Differential Revision: https://phab.getgrist.com/D3032