[low prio] Check z-index of modals and other views

[TheBestPessimist]

Test shall include:

• Customer Fixtures to use: (if needed)
• What to test
• Expectation for the test to be successful

Todo for developer (besides coding)

• Always make sure the issue is in the correct project lane
• [ ] run your test in jenkins e2e on a vanilla db
• [ ] jenkins console URL / cypress dashboard URL to the successful test run (alternatively screenshot)
• [ ] get it integrated into master
  • [ ] (pull request URL)

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Test concept

An e2e test which checks which views (by view i mean: modals, navbar, overlays, notifications, the referenced documents, the action menu, etc.) are over (above) and under (below) other views.

We should somehow define some rules about the z-index of each of these views, and test that via cypress.

For example the modal of a process is under the navigation bar currently, which is wrong: https://github.com/metasfresh/me03/issues/1990#issuecomment-506684448

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Example:

In the Sales invoice window (http://localhost:3000/window/167/1000000), when opening a process (eg. Gutschrift erstellen), the modal is below the navbar.

Navbar z-index: 100

Modal z-index: 98

[siemiatj]

This won't work if z-index is not in inline style. And in 99% of the time it'll be a pain to add. I don't see a reason for such a test tbh. Just setting the z-indexes to values that make sens is enough.