[Proposal] Optionally show dropdown (without filter) when using a dynamic source

[mbolli]

• add an option sourceDefaultSelection (or something like that) which accepts the same values as the source option
• a dev could then fetch a list of most commonly used tags, or if the list is small, the complete list of tags to help the user get an overview over what to select
• this list would appear if the user clicks in the text field (exactly like when using a select element)