title: Flutter Searchable Dropdown Search Problem
body: <p>When I try to filter it is not searching correct.
  problem just search (filter last value)</p>
  <p>My git: <a href="https://github.com/YGRL/TesteSearchDropdown" rel="nofollow noreferrer">https://github.com/YGRL/TesteSearchDropdown</a></p>
  <p>font: <a href="https://pub.dev/packages/searchable_dropdown" rel="nofollow noreferrer">https://pub.dev/packages/searchable_dropdown</a></p>
  <p><a href="https://i.stack.imgur.com/Q7rSv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q7rSv.png" alt="enter image description here" /></a></p>