Make it an option whether navigation of ItemList must be the same row

[feois]

Describe the project you are working on

Not important

Describe the problem or limitation you are having in your project

When the selected item is at the start or the end of the row, event ui_left or ui_right respectively does nothing

Describe the feature / enhancement and how it helps to overcome the problem or limitation

See below

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

When invoking event ui_right while the selected item is at the end of the row of ItemList, it should switch selection to the first item of next row, vice versa, when invoking event ui_left while the selected item is at the front of the row, selection should switch to the last item of previous row.

If this enhancement will not be used often, can it be worked around with a few lines of script?

Well yes, this can be implemented in scripts, it's inconvenient (plus you need to check if ItemList is the focus)

Is there a reason why this should be core and not an add-on in the asset library?

ItemList is core node

[feois]

While reading ItemList source code, I found out that it's not a limitation but instead an intentional choice (!IS_SAME_ROW).
If so, I propose that it's made a choice.

[Calinou]

This can likely be done by adding an Allow Wraparound boolean property, similar to what I proposed in #5139.