EuiComboBox doesn't behave well in single selection mode

[timroes]

When using the EuiComboBox with singleSelection={{ asPlainText: true }} it behaves not very well.

If you selected a value and then focus that field again and try to search for a new value, values are shown, but you cannot navigate anymore and replace that existing value. I am using here a GIF that @cchaos already posted in elastic/kibana#31585.

Since we're needing that component a lot while moving the existing visualize editor over to React, we are currently blocked on this component to behave properly.

Also if you searched for a suggestion and hit Escape now, you're left with a broken state where your search is still shown in the combobox:

[cchaos]

Thank you for making this issue. It bugs me so much too. I think we're somewhat at the mercy of an external plugin though react-input-autosize.

@chandlerprall does this look like something that could be fixed (quickly)? All of TSVB also just converted to using the single selection as text style so it's becoming a lot more popular.

[cchaos]

The other half of that issue is that after having selected an item, you can keep typing and even leave it in a state where you've typed in something and it persists after leaving the combobox.

Whoops, posted in the issue not the PR... moving comment