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This pull request reverts the changes in #155757. The auto-formatter created conflicts in the master branch, so the revert was performed manually in #160643. For this cherry-pick PR, I was able to run `git revert 21381d843f3feb32640ae385aedd8e5c4003696b` without any problems. <br> ### Issue Links bug reports: #160196, #160555 cherry-pick request: #161176 ### Target stable ### Changelog Description Passing a list literal to a `DropdownMenu` causes the widget to reset to the `initialSelection` after each build. ### Impacted Users This affects anyone using the [DropdownMenu](https://api.flutter.dev/flutter/material/DropdownMenu-class.html) widget. ### Impact Description The impact usually consists of the text value being inconveniently reset each time the widget is rebuilt. (In some cases it can be a fatal crash: the code sample from #160196 shows how this change can lead to an infinite build loop.) ### Workaround This regression can be mitigated by caching & modifying a single list instance, rather than using a list literal for the `DropdownMenu` constructor. ### Risk low ### Test Coverage yes ### Validation Steps #160643 added a regression test for this revert. The fix can also be verified by running the code sample from #160196 and verifying that there is no infinite build loop.
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