dropdown keyboard fixes

[XhmikosR]

BTW does it make sense to open the dropdown but not select the first/last element depending on the arrow key?

I feel like it's an extra key. But that's for later too. :)

Originally posted by @XhmikosR in #32750 (comment)

[XhmikosR]

I guess for v5 that's OK to do, for v4 not sure if it's a considered a breaking change. But the current situation does not make a lot of sense to me.

[sijusamson]

I would be working on this :-)

[XhmikosR]

Thanks! See if you can deduplicate the code to get rid of the linting warning too :)

[sijusamson]

@XhmikosR I was able to fix the issue, but I couldn't find any alternate solution to remove the linting warning.