Layer opacity should be hidden when there are no layers

[benel]

Description

What is the valuable outcome that cannot be achieved because of this bug?

For which stakeholder (people, role, project, domain) is it important?

Reproduction scenario

Expected behavior

A clear and concise description of what you expected to happen.

Environment

• OS: [e.g. Windows 10, macOS 10.15, iOS]
• Browser: [e.g. chrome 88, safari 14]

Workaround

Solution you found to avoid the problem.

Deliverables status

Phase 1

• [ ] Scenarios (Gherkin)
• [ ] Implementation strategy

Phase 2

• [ ] Acceptance tests (Capybara)
• [ ] Implementation