z-index regressions

[mhsdesign]

we lately needed to adjust the z-indexes of certain parts.

This has caused this regression so far: https://github.com/neos/neos-ui/issues/3583

but also as just noted on slack another plugin might be affected: https://neos-project.slack.com/archives/C0U0KEGDQ/p1691562182154419?thread_ts=1691496966.330329&cid=C0U0KEGDQ

jon and me also noticed that a selectbox editor doesnt work correctly in the secondary editor as soon as the "pending" changes overlay is in place as this index is higher.

This issue should track all the changes being made to our z-index configuration, so its more obvious that certain things changed and that this could be the reason that your plugin wont work.

Sorry for any inconveniences

css variable configuration cssVariables.css vs packages/build-essentials/src/styles/styleConstants.js

see explanation https://github.com/neos/neos-ui/pull/3438

WIP

[mhsdesign]

How to reproduce: use the Neos.Neos/Inspector/Secondary/Editors/CKEditorWrap editor and open the secondary editor, do changes and still expect the paragraph/heading selector to still work.

Alternative testcase is just to create a secondary editor with a selectbox, and commit changes and then try to open the selectbox.