Z-index of elevated secondary editor is greater than the dialog container making it impossible to handle dialogs

[Sebobo]

Description

When there are unapplied changes in the inspector the secondary inspector (e.g. editing assets in the Media.UI) gets the elevated flag resulting in a z-index of 65.
When the secondary editor opens a dialog this dialog is in a container with a z-index of 55, therefore the editor looks broken, as the dialog is behind the editor and cannot be confirmed.

This results in issues with the Media.UI, see Flowpack/media-ui#239

Also sometimes the dialog You still have changes. What do you want to do with them? opens when trying to edit the selected asset.

Expected behavior

Dialogs should always be on top of the secondary editor.

Actual behavior

Dialog triggered by there secondary editor is hidden behind the secondary editor in cases of existing unapplied changes:

Affected Versions

Neos: 8.3

UI: 8.3