User Story

As a developer, I want to declare a cell with list-based validation, using several possible choices.
When the user accesses the cell, I want the drop-down to be visible and filtered based on the current in-edition cell value, and to be able to select one of the dropdown values (using keyboard or mouse) as the full entered value for that cell

current state

open attached keikai-validation-autocomplete.xlsx in Keikai
Place selection in A2
Type "a", then type another "a"
Cell in-edition value is aa, validation drop-down is not visible

Expected Result

validation drop-down is visible, and filtered using current cell value (should contain option 1 and 2 only)