Fix #96427

* Fix widget in cell editor cutoff by the titlebar.

* Move zindex update internal to notebook

* remove unused css

* update zindex only closing notebook editor

* adopt fixed overflow widget option

* overflow visible is not needed for fixed element.

* optional transformOptimization

* remove unncessary position static and overflow visible

Fix #95662

Fix #94314

This reverts commit 2f3fdcee.

Can't just use outline-offset on the element itself, it goes under the child background color