Related https://github.com/flutter/flutter/issues/100624

The goal is to make sure the engine can send a location string in either the existing format or a complete uri string to the framework, and the framework will still work as usual.

Remove 1745 decorative breaks

Documentation improvements

* dart fix --apply

* manual fixes

* allow focus to leave FlutterView

* fix tests and docs

* small doc update

* fix analysis lint

* use closed loop for dialogs

* add tests for new API

* address comments

* test FocusScopeNode.traversalEdgeBehavior setter; reverse wrap-around

* rename actionResult to invokeResult

* address comments

* Update navigator.dart

* Update navigator.dart

* Add test

* Update navigator.dart

* lint

* Update packages/flutter/test/widgets/navigator_test.dart
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>

* Update packages/flutter/test/widgets/navigator_test.dart
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>

* Allows pushing page based route as pageless route

* update

* impl

* Update packages/flutter/lib/src/widgets/navigator.dart
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>

* Update navigator_test.dart
Co-authored-by: chunhtai <47866232+chunhtai@users.noreply.github.com>

* Use `curly_braces_in_flow_control_structures` for `widgets`

* fix comments

* fix comments

See https://github.com/flutter/flutter/pull/103719

This reverts commit e2d12060.

* Reland "Fixes zero route transition duration crash (#90461)"

This reverts commit 403c1de5.

* Fix paged base route pop before push finishes crashes

This reverts commit 0eeb026e.

This reverts commit 5fd259be.

This does a cleanup of the examples, removing all of the "section" markers and extra comments that we don't need anymore now that the samples are no longer in the source code. It also removes the --template arguments from the {@tool dartpad} and {@tool sample} directives, since those are no longer used. It converts two examples that I discovered were still embedded into linked examples in the examples folder.

I didn't delete the templates from the snippets config folder yet, because there are still embedded samples in the dart:ui package from the engine that use them. Once dart:ui no longer uses the templates, they can be removed.

I bumped the version of the snippets package to pick up a change that allows removal of the --template argument.