Change Selected value for OptionButton when last item is deleted.

[chsoen]

• Fixes Visual bug in OptionButton #105582
• Also fixes selected value not changing when last item is deleted.

Note: undoing the deletion of the last item will not update selected. As far as I could tell, undoing adds back the item that was deleted.
This lead me to conclude that there is no way of undoing the selected value without being able to determine the add was part of an undo.

[KoBeWi]

This only works if you delete the last element, but you can still delete more elements at once and cause invalid button state.

[chsoen]

This only works if you delete the last element, but you can still delete more elements at once and cause invalid button state.

Thanks for the review!
I made a new commit addressing this hopefully. Whenever the current selected value is more than the new size, it will default to selecting the last item in the list (-1 if there are no items). I only tested it with clearing the entire list; I'm not sure if there is some other way of removing items from the list I don't know about.

[KoBeWi]

The commits need to be squashed.

I only tested it with clearing the entire list; I'm not sure if there is some other way of removing items from the list I don't know about.

item_count can be changed from code.

[Repiteo]

Thanks! Congratulations on your first merged contribution! 🎉