tree 8db46ceee620fb8dc392851de1c38724c659ffd5
parent 63f2fb9f5d02889bb6a73f690ff8192c3aab2b1f
author Michael Klimushyn <mklim@google.com> 1537997306 -0700
committer GitHub <noreply@github.com> 1537997306 -0700
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Prevent dropdown menu's scroll offset from going negative (#22235)

In long lists this resulted in the dropdown scrolling to the very last
item in its list. Now clamping the value at `0.0`. Added a test to
verify that the selected item aligns with the button to test the offset.

Fixes flutter/flutter#15346