SimpleCombo: Selection should behave like Select

[Timmeeeey]

Is your feature request related to a problem? Please describe.

When you select an item in a SimpleCombo that's already selected, the selection gets cleared.

Describe the solution you'd like

I think it would be better for the user experience if the selection is not cleared so it behaves like a normal select.
It happens sometimes that the user is wondering why the combo is empty after he selected an item.
To clear an input the user can always do it with a click on the X or clearing the input with Backspace.