Drag and drop ordering not working properly in LayerControl.

[viktoraronfarkas]

Screen.Recording.2023-11-23.at.11.53.50.mov

The dragged item always jumps up to top, no matter what position I am trying to move it to.

[silvester-pari]

It's hard to tell why the error appears in some cases, in others not, since in the storybook and also in the tests it works fine: https://eox-a.github.io/EOxElements/?path=/story/elements-eox-layercontrol--primary

It might be that inside the app, something is hooking into e.g. change:length, and updating the layers there as well in parallel to the layercontrol.

There seems to be some general issue with the sorting, we have a PR that tries to cover this as well: #344. It originally started with #302, but more and more issues with the sorting were found :-(

[silvester-pari]

Turns out this erratic jumping behavior is because of a hidden layer that messes up the index.