fixes https://github.com/flutter/flutter/issues/107615

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* Make Flex,Row,Column const for real

* dart fix --apply

* fix snippets

* fix integration test

* add comment

This reverts commit 41b50c22.

This reverts commit f477c8b1.

* Update parameters to the `styleFrom` button methods.

* Updated the Flutter fix data to point to this PR.

* Updated handling of background color to better maintain backwards compatibility with previous API.

* Incorrect size comparison
* Code cleanup/formatting
* Additional tests

* Add semantics sort key for modal scope and modal barrier

* fix test

* fix test

* fix test

* fix space

* fix more tests

* addressing comments

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

Default `semanticsEnabled` to true for `testWidgets` and fix associated bugs

* fix some formatting issues

* address review comments

* fix indent

* add trailing commas on list/map/parameters

* add trailing commas on Invocation with nb of arg>1

* add commas for widget containing widgets

* add trailing commas if instantiation contains trailing comma

* revert bad change

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests

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