Shi-Hao Hong 734ddd3103
Make DropdownButton's disabledHint and hint behavior consistent (#42479)
* Fix DropdownButton disabledHint behavior

* Fix hint behavior when selectedItemBuilder is null

* Improve variable names, some formatting updates

* Create _DropdownMenuItemContainer widget

* Improve API docs to be consistent with hint/disabledHint actual behavior
2019-10-28 11:00:33 -07:00
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