[Feature request] Make auto-completion popup list cyclable

Is there an existing issue for this?

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Description of the Issue

The selection in the auto-completion popup list should be able to cycle.

Plus:
The RIGHT Arrow key should be accepted as the completion key.

Describe the solution you'd like.

The selection in the auto-completion popup list should be able to cycle:
if the first item is selected and I press the UP Arrow key, the selection should go to the last item;
and similarly, if the last item is selected and I press the DOWN Arrow key, the selection should go to the first item.
I know, I can use PageUp and PageDown to make jumps in the list but it's more convenient to use the arrow keys only.

And a related request:
The RIGHT Arrow key should be accepted as the completion key. This way it would be very easy to quickly make the completion with my fingers on the arrow keys.

Debug Information

n/a

Anything else?

No response

Start by locating the C++ implementation and tests for the auto-completion popup and its arrow-key handling. Verify the desired wraparound behavior for UP and DOWN, and acceptance of RIGHT as a completion key; done means both behaviors work consistently in the popup.