Dropdown: Multiple repetitive line entries erroneously added to the dropdown list

[ghost]

Steps

• Add a Semantic-UI-React dropdown component which includes both the 'search' and the 'allowAdditions' option. Implement the onAddItem event callback.
• Click into the search box and type some unique text not already available in the dropdown, but don't hit enter.
• Using arrow keys, traverse the active cell up and down past the 'Add' line entry a few times.

Expected Result

No additional item is added to the dropdown list since neither the enter key was not pressed nor the 'Add' line entry was clicked.

Actual Result

Multiple repetitive additional items were erroneously added to the dropdown list, one for each time the user navigated past the 'Add' line entry using the arrow keys.

Version

[email protected]

[levithomason]

Please provide a working codesandbox example using the link in the issue template. I apologize, we simply don't have the time to recreate all issues ourselves.