
## Description This PR fixes `DropdownMenu` default width when a long label is provided. Before: The width is based on the longest menu item (which can be smaller than the label):  After: The width also depends on the label width when it is longer than the menu items.  ## Related Issue Fixes [DropdownMenu default width does not take label into account](https://github.com/flutter/flutter/issues/136678) ## Tests Adds 2 tests.