DropDownMenu should use ScrollableList (#3745)

Previously it used Block, which is less efficient for large numbers of items.
Also move the top margin out of the menu item to fix the baseline alignment of
the text.

Fixes #1615
2 files changed
tree: abfc6afb700850d5f3eaf5ca7b9269940bf07496
  1. bin/
  2. dev/
  3. examples/
  4. infra/
  5. packages/
  6. travis/
  7. .travis.yml
  8. AUTHORS
  9. CONTRIBUTING.md
  10. ISSUE_TEMPLATE.md
  11. LICENSE
  12. README.md
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