Positioning of CEs broken while drag-n-drop is active

[rr-it]

CEs from inside a container element are wrongly positioned while drag-n-drop is active.

In this example you can still see the dragged CE. If the CE is further down the page you can't see it at all.

[rr-it]

Related TYPO3 core issue:
https://forge.typo3.org/issues/103536

[rr-it]

PR https://review.typo3.org/c/Packages/TYPO3.CMS/+/83650

[dbruening]

Unfortunately, the approach in the core issue does not solve the problem. position: relative; is necessary because the top, left, right values are set using JavaScript. I suggest an incorrect value calculation of the top value for the elements within the container.

[rr-it]

For TYPO3 v12 there won't be any fix in core - even though v12 is still in "Regular Maintenance" ( https://typo3.org/cms/roadmap#section-support-times ).
So we should implement a fix in b13/container especially for TYPO3 v12.
See https://review.typo3.org/c/Packages/TYPO3.CMS/+/83650/comments/9c008db0_c0de45e8

For TYPO3 v13 core merger doesn't see an actual bug here and only merges a change as 'feature' or 'task'.
See https://review.typo3.org/c/Packages/TYPO3.CMS/+/83650/comments/42950ee1_7e0fccff

If the core needs "fixing" we might want to get any change into TYPO3 v13 before it gets released:

• 13.3 "Feature freeze": estimated 2024-09-17
• 13.4 "LTS-release": estimated 2024-10-15

[simonschaufi]

so can this be fixed in the extension or must this be fixed in the core?