[cupertino_ui,material_ui] Import from flutter/flutter (#11888)

A recreate of #11669 by
recopying all flutter/flutter stuff from scratch, and cherry picking all
of my subsequent commits.

This is a single super mega PR attempting to migrate all Material and
Cupertino code from flutter/flutter to material_ui and cupertino_ui.

### How the PR was created

```
git filter-repo --path packages/flutter/lib/src/material --path packages/flutter/test/material --path examples/api/lib/material --path examples/api/test/material --path packages/flutter/lib/src/cupertino --path packages/flutter/test/cupertino --path examples/api/lib/cupertino --path examples/api/test/cupertino --path packages/flutter/lib/fix_data/fix_material --path packages/flutter/test_fixes/material --path packages/flutter/lib/fix_data/fix_cupertino.yaml --path packages/flutter/test_fixes/cupertino 
cd ../packages
git remote add source-origin ../flutter
git fetch source-origin
git merge source-origin/master --allow-unrelated-histories
```

I then cherry picked everything I could from the previous PR
(#11669), skipping merge
commits.

### What was included in the copy

 * The main source code (packages/flutter/lib/src/<material/cupertino>).
 * The widget/unit tests (packages/flutter/test/<material/cupertino>).
 * The examples (examples/api/lib/<material/cupertino>).
 * The example tests (examples/api/test/<material/cupertino>).
 * The dart fixes (packages/flutter/lib/fix_data).
 * The dart fix tests (packages/flutter/test_fixes).

### TODOs

 * [x] Do exports for Material and Cupertino.
* [x] Confirm the directory structure (current plan: lib/src/ for now,
reorganize after 1.0.0).
 * [x] Try installing and using the packages locally.
* [x] Try running the tests locally (works except for tests with cross
imports).
* [x] Try running the example tests locally (work after migrating
`package:flutter_api_samples` import).
 * [x] Verify examples work.
* [x] Verify that `git blame` appears the same in both repos on various
files. (Yes, but the SHAs are different, as expected.)
 * [x] Add auxiliary files for dart fixes and tests.
* [x] Port imports of material/cupertino in places like examples/test to
use the new packages.
 * [x] ~~Fix~~ Skip all test cross imports.
* [x] Make sure the analyzer is working in the same exact way as it does
in flutter/flutter. (#11692)

### Open questions

 * ~~Are we sure about the directory structure?~~
   * Confirmed with @dkwingsmt and @QuncCccccc.
* Anything else that should be ported along with this? If these commits
touch files that are not included in this PR, but that we later port in,
the commits will likely have different SHAs.
* I'm hoping we got it all at this point but if anyone notices anything
let me know.
 * ~~Do we like the examples setup?~~
* Worked with @stuartmorgan-g and @chunhtai to get this to match the
other packages in this repo.
* Are we cool with skipping cross imports tests and fixing them later?
This approach should not fracture commits because the commits were made
in flutter/flutter after the code was copied.
   * Tests are in the temporarily_skipped_tests folder.

### How to try using these packages

Add the local packages to your project:

```
flutter pub add cupertino_ui --path ../../packages/packages/cupertino_ui
flutter pub add material_ui --path ../../packages/packages/material_ui  
```

Then import the packages instead of the libraries in the SDK:

```diff
- import 'package:flutter/material.dart';
- import 'package:flutter/cupertino.dart';
+ import 'package:material_ui/material_ui.dart';
+ import 'package:cupertino_ui/cupertino_ui.dart';
```

### How to review this PR

 * Do read the PR description at the top, including Open Questions.
* Don't read all 600k+ lines changed! Ignore the main source code and
test files. The only thing I changed in there is to change imports from
`flutter/material.dart` to `material_ui/material_ui.dart` and the
equivalent for Cupertino.
* Do look closely at the file tree browser on the left side of the
"Files Changed" tab, though. Check the directory structure of
material_ui and cupertino_ui and make sure it looks good to you.
* Do take a look at the small config files like pubspecs,
analysis_options, etc.
* See the examples and their tests now located in
material_ui/material_ui_examples and cupertino_ui/cupertino_ui_examples.
* See the data driven fixes in lib/fix_data and their tests in
test_fixes.

And let me know if there is any code that's not in this PR that you
expected to be. It will be best to get everything we can in this one PR
rather than following up later in order to prevent fragmenting commits.

### Resources

 * Closed PR where i tried to import everything but forgot dart fixes.
    - #11568
* Closed PR where I tried and failed to import a single widget by
individually importing all of its transitive dependencies with `git
filter-repo` commands.
   * #11526
* Closed PR where I tried to import just colors.dart (no dependencies),
but found that it would create different SHAs between it and this mega
PR.
   * #11543
* Closed PR where I tried to import all of Material, before realizing
that I would create different SHAs between that PR and a future
Cupertino PR.
   * #11549
* Closed main big PR with most of the history:
#11669
* Closed PR where I tried to cherry pick everything:
#11887

Author: stuartmorgan-g

packages/cupertino_ui/analysis_options.yaml

@@ -0,0 +1,8 @@
+include: ../../analysis_options.yaml
+
+analyzer:
+  exclude:
+    - "test_fixes/**"
+    # TODO(justinmc): Remove the following exclusion when cross-imports are
+    # fixed. See https://github.com/flutter/flutter/issues/177028.
+    - "temporarily_disabled_tests/**"

packages/cupertino_ui/ci_config.yaml

@@ -0,0 +1,4 @@
+# TODO(stuartmorgan): Remove this; see https://github.com/flutter/flutter/issues/102679
+exempt_from_excerpts: true
+release:
+  batch: false

packages/cupertino_ui/example/.gitignore

@@ -0,0 +1,3 @@
+# Unused platform specific files
+android/
+ios/

packages/cupertino_ui/example/.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "89172fc6152056af222e0afcf6e2d6ee4e9f6f8f"
+  channel: "master"
+
+project_type: package

packages/cupertino_ui/example/README.md

@@ -0,0 +1,110 @@
+# cupertino_ui API Example Code
+This directory contains the example code that is referenced in the documentation
+in cupertino_ui's source code.
+
+These examples were originally located [in
+flutter/flutter](https://github.com/flutter/flutter/tree/master/examples/api)
+before the Cupertino library was decoupled and moved into its current home in
+flutter/packages.
+
+The examples can be run individually by just specifying the path to the example
+on the command line (or in the run configuration of an IDE).
+
+For example (no pun intended!), to run the first example from the
+`CupertinoActivityIndicator` class in Chrome, you would run it like so from the
+[example](.) directory:
+
+```sh
+% flutter run -d chrome lib/activity_indicator/cupertino_activity_indicator.0.dart
+```
+
+All of these same examples are available on the API docs site.
+
+<!-- TODO(justinmc): Include a link to the docs page with the example above like this: For instance, the example above is available on [this page](https://api.flutter.dev/flutter/animation/Curve2D-class.html#animation.Curve2D.1).
+-->
+
+## Naming
+
+> `lib/file/class_name.n.dart`
+>
+> `lib/file/class_name.member_name.n.dart`
+
+The naming scheme corresponds to the files under [lib/src](../lib/src) where
+each file is represented as a directory (without the `.dart` suffix), and each
+sample in the file is a separate file in that directory. So, for the example
+above, where the examples are from the
+[lib/src/activity_indicator.dart](../lib/src/activity_indicator.dart) file, the
+`CupertinoActivityIndicator` class, the first sample (hence the index "0") for
+that symbol resides in the file named
+[lib/activity_indicator/cupertino_activity_indicator.0.dart](lib/activity_indicator/cupertino_activity_indicator.0.dart).
+
+Symbol names are converted from "CamelCase" to "snake_case". Dots are left
+between symbol names, so the first example for symbol
+`InputDecoration.prefixIconConstraints` would be converted to
+`input_decoration.prefix_icon_constraints.0.dart`.
+
+If the same example is linked to from multiple symbols, the source will be in
+the canonical location for one of the symbols, and the link in the API docs
+block for the other symbols will point to the first symbol's example location.
+
+## Authoring
+
+When authoring examples, first place a block in the Dartdoc documentation for
+the symbol you would like to attach it to. Here's what it might look like if you
+wanted to add a new example to the `CupertinoActivityIndicator` class:
+
+```dart
+/// {@example /example/lib/activity_indicator/cupertino_activity_indicator.0.dart}
+/// Write a description of the example here. This description will appear in the
+/// API web documentation to introduce the example.
+/// {@end-example}
+```
+
+The path parameter is from the root of the package when beginning with `/`,
+otherwise it is relative to the current file.
+
+Once that comment block is inserted in the source code, create a new file at the
+appropriate path under [`example/lib`](./lib). See all of the existing examples
+in that directory for different types of examples with some best practices
+applied.
+
+The filename should match the location of the source file it is linked from, and
+is named for the symbol it is attached to, in lower_snake_case, with an index
+relating to their order within the doc comment. So, for the
+`CupertinoActivityIndicator` example above, since it's in a file called
+`activity_indicator.dart`, and it's the first example, it should have the name
+`example/lib/activity_indicator/cupertino_activity_indicator.0.dart`.
+
+You should also add tests for your example code under [`example/test`](./test),
+that matches their location under [lib](./lib), ending in `_test.dart`. See the
+section on [writing tests](#writing-tests) for more information on what kinds of
+tests to write.
+
+The entire example should be in a single file.
+
+Only packages that can be loaded by Dartpad may be imported. If you use one that
+hasn't been used in an example before, you may have to add it to the
+[pubspec.yaml](pubspec.yaml) in the [example](./) directory.
+
+## Writing Tests
+
+Examples are required to have tests. There is already a "smoke test" that simply
+builds and runs all the API examples, just to make sure that they start up
+without crashing. Test coverage is required for examples, but should take care
+not to complicate the example strictly for the purpose of testing.
+
+As an example, in regular framework code, you might include a parameter for a
+`Platform` object that can be overridden by a test to supply a dummy platform,
+but in the example. This would be unnecessarily complex for the example. In all
+other ways, these are just normal tests. You don't need to re-test the
+functionality of the widget being used in the example, but you should test the
+functionality and integrity of the example itself.
+
+Tests go into a directory under [test](./test) that matches their location under
+[lib](./lib). They are named the same as the example they are testing, with
+`_test.dart` at the end, like other tests. For instance, an
+`CupertinoActivityIndicator` example that resides in
+[`lib/activity_indicator/cupertino_activity_indicator.0.dart`]( ./lib/activity_indicator/cupertino_activity_indicator.0.dart) would
+have its tests in a file named
+[`test/activity_indicator/cupertino_activity_indicator.0_test.dart`](
+./test/activity_indicator/cupertino_activity_indicator.0_test.dart)

packages/cupertino_ui/example/analysis_options.yaml

@@ -0,0 +1,12 @@
+# This file is also used by dev/bots/analyze_snippet_code.dart to analyze code snippets (`{@tool snippet}` sections).
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  rules:
+    # Samples want to print things pretty often.
+    avoid_print: false
+    # Samples are sometimes incomplete and don't show usage of everything.
+    unreachable_from_main: false

packages/cupertino_ui/example/lib/activity_indicator/cupertino_activity_indicator.0.dart

@@ -0,0 +1,75 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:cupertino_ui/cupertino_ui.dart';
+
+/// Flutter code sample for [CupertinoActivityIndicator].
+
+void main() => runApp(const CupertinoIndicatorApp());
+
+class CupertinoIndicatorApp extends StatelessWidget {
+  const CupertinoIndicatorApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const CupertinoApp(
+      theme: CupertinoThemeData(brightness: .light),
+      home: CupertinoIndicatorExample(),
+    );
+  }
+}
+
+class CupertinoIndicatorExample extends StatelessWidget {
+  const CupertinoIndicatorExample({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const CupertinoPageScaffold(
+      navigationBar: CupertinoNavigationBar(
+        middle: Text('CupertinoActivityIndicator Sample'),
+      ),
+      child: Center(
+        child: Column(
+          mainAxisAlignment: .spaceEvenly,
+          children: <Widget>[
+            Column(
+              mainAxisAlignment: .center,
+              children: <Widget>[
+                // Cupertino activity indicator with default properties.
+                CupertinoActivityIndicator(),
+                SizedBox(height: 10),
+                Text('Default'),
+              ],
+            ),
+            Column(
+              mainAxisAlignment: .center,
+              children: <Widget>[
+                // Cupertino activity indicator with custom radius and color.
+                CupertinoActivityIndicator(
+                  radius: 20.0,
+                  color: CupertinoColors.activeBlue,
+                ),
+                SizedBox(height: 10),
+                Text(
+                  'radius: 20.0\ncolor: CupertinoColors.activeBlue',
+                  textAlign: .center,
+                ),
+              ],
+            ),
+            Column(
+              mainAxisAlignment: .center,
+              children: <Widget>[
+                // Cupertino activity indicator with custom radius and disabled
+                // animation.
+                CupertinoActivityIndicator(radius: 20.0, animating: false),
+                SizedBox(height: 10),
+                Text('radius: 20.0\nanimating: false', textAlign: .center),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

packages/cupertino_ui/example/lib/activity_indicator/cupertino_linear_activity_indicator.0.dart

@@ -0,0 +1,77 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:cupertino_ui/cupertino_ui.dart';
+
+/// Flutter code sample for [CupertinoLinearActivityIndicator].
+
+void main() => runApp(const CupertinoLinearActivityIndicatorApp());
+
+class CupertinoLinearActivityIndicatorApp extends StatelessWidget {
+  const CupertinoLinearActivityIndicatorApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const CupertinoApp(
+      theme: CupertinoThemeData(brightness: .light),
+      home: CupertinoIndicatorExample(),
+    );
+  }
+}
+
+class CupertinoIndicatorExample extends StatelessWidget {
+  const CupertinoIndicatorExample({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const CupertinoPageScaffold(
+      navigationBar: CupertinoNavigationBar(
+        middle: Text('CupertinoLinearActivityIndicator Sample'),
+      ),
+      child: Padding(
+        padding: .all(8.0),
+        child: Column(
+          mainAxisAlignment: .spaceEvenly,
+          children: <Widget>[
+            Column(
+              mainAxisAlignment: .center,
+              children: <Widget>[
+                CupertinoLinearActivityIndicator(progress: 0),
+                SizedBox(height: 10),
+                Text('Progress: 0'),
+              ],
+            ),
+            Column(
+              mainAxisAlignment: .center,
+              children: <Widget>[
+                CupertinoLinearActivityIndicator(progress: 0.2),
+                SizedBox(height: 10),
+                Text('Progress: 0.2', textAlign: .center),
+              ],
+            ),
+            Column(
+              mainAxisAlignment: .center,
+              children: <Widget>[
+                CupertinoLinearActivityIndicator(progress: 0.4, height: 10),
+                SizedBox(height: 10),
+                Text('Height: 10', textAlign: .center),
+              ],
+            ),
+            Column(
+              mainAxisAlignment: .center,
+              children: <Widget>[
+                CupertinoLinearActivityIndicator(
+                  progress: 0.6,
+                  color: CupertinoColors.activeGreen,
+                ),
+                SizedBox(height: 10),
+                Text('Color: green', textAlign: .center),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

packages/cupertino_ui/example/lib/bottom_tab_bar/cupertino_tab_bar.0.dart

@@ -0,0 +1,58 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:cupertino_ui/cupertino_ui.dart';
+
+/// Flutter code sample for [CupertinoTabBar].
+
+void main() => runApp(const CupertinoTabBarApp());
+
+class CupertinoTabBarApp extends StatelessWidget {
+  const CupertinoTabBarApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const CupertinoApp(
+      theme: CupertinoThemeData(brightness: .light),
+      home: CupertinoTabBarExample(),
+    );
+  }
+}
+
+class CupertinoTabBarExample extends StatelessWidget {
+  const CupertinoTabBarExample({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoTabScaffold(
+      tabBar: CupertinoTabBar(
+        items: const <BottomNavigationBarItem>[
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.star_fill),
+            label: 'Favorites',
+          ),
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.clock_solid),
+            label: 'Recents',
+          ),
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.person_alt_circle_fill),
+            label: 'Contacts',
+          ),
+          BottomNavigationBarItem(
+            icon: Icon(CupertinoIcons.circle_grid_3x3_fill),
+            label: 'Keypad',
+          ),
+        ],
+      ),
+      tabBuilder: (BuildContext context, int index) {
+        return CupertinoTabView(
+          builder: (BuildContext context) {
+            return Center(child: Text('Content of tab $index'));
+          },
+        );
+      },
+    );
+  }
+}