https://codepen.io/lkoumis1/pen/zYyOrLb?editors=1100
Dropdown has a trigger slot to support floating lists, however Combobox does not as it is intended as an input and dropdown-based selection, which allows for quick filtering of single and multi-selections.
This is where the two components differ in design intent, mentioned in the Dropdown Groups single selection thread earlier this week.
I guess we can't have the best of both components (dropdown and combobox). Dropdown does not support multiple groups with one selection (llink ) and Combobox doesn't support trigger slot.
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