Ensure clicking "Log" in command menu works for workflows in GScan sidebar

[MetRonnie]

Closes #1507

Check List

• [x] I have read CONTRIBUTING.md and added my name as a Code Contributor.
• [x] Contains logically grouped changes (else tidy your branch by rebase).
• [x] Does not contain off-topic changes (use other PRs for other changes).
• [x] Tests are included
• [x] CHANGES.md entry included if this is a change that can affect users

[MetRonnie]

Merging with 2 approvals, latest change pushed to address review comments should be uncontroversial