Generated.xcconfig is only required at build time for iOS apps. In the
flutter create project template and example apps, Generated.xcconfig was
previously marked as a resource to be bundled into the built app.

While working on attach, I changed the message output while waiting for an app to connect but didn't catch this.

* Extract some of startApp into a reusable method

* Get basic attach --machine working

* Attach --machine tweaks

Move validation to validate method and create daemon early so we get the startup event before trying to get a connection.

* Bump daemon version so we know whether it's valid to flutter attach

* Tweak output text

* Swap package imports for relative

* Review tweaks (naming, formatting, typedefs)

* Separate arguments from process spawning

This will make calling attach easier

* Add a basic test for flutter attach --machine

* Fix crash if port unforward modifies the list of forwarded ports

* Add a no-op port forwarder for flutter-tester

* Switch to using BasicProject instead of our own inline code

* Fix expectation in test now we have a portForwarder

* Remove stale TODO (this is done)

* Tweak formatting

* Change some Completers to void to fix Dart 2 issues

* Make cleanup of flutter processes in tests more reliable

* Fix quit signals

I confused SigInt&SigTerm for SigTerm&SigKill when I first did this. SigTerm can be blocked and doesn't guarantee the process will be terminated.

* Don't use deprecated constants

* Fix typo

* Add some additional info to debug buffer

* Fix return types on Futures

* Only printError on our simple messages

Any other type is a real error that should be a normal crash (to get a proper error log).

See #19453.

* Add toList() to convert Iterable<String> -> List<String>

This code previously throw in Dart-2 mode.

Fixes #19453.

* Move getSimulatorPath into Xcode

* Add a test that we tried to launch the simulator

* Remove unused import

* Add sample of multicolumn picker to Flutter Gallery
* Modify CupertinoPicker to be able to be rendered off-center.

Flutter app development has been Dart 2 only for a significant amount of
time, and we're about to remove all support for Dart 1.

Currently only Android views are supported.

This also includes a FakePlatformViewsController which is a fake
implementation of the engine side for testing.

Cirrus CI has macOS VMs, so this turns on an instance for tests so that we can evaluate if we can use Cirrus for all three platforms or not.

Makes them all be generated on Linux and fixes some to not be so large.

Bug: https://github.com/flutter/flutter/issues/19435

Bug: https://github.com/flutter/flutter/issues/19494

Fixes https://github.com/flutter/flutter/issues/19465

This reverts commit b0eb1632.

This reverts commit cc1cf13e.

* Chevrons in month picker are semi-transparent when the month is scrolled

* Added type missing annotation

This reverts commit 57d78cc7.

This reverts commit 44995dc4.

This uses @kevmoo's completion package to do command line completion for flutter, and a new command "bash-completion" (with alias "zsh-completion") that will output the necessary shell script setup code, and adds the hidden command "completion" that does the actual completion.

Because it adds a dependency, I also had to do flutter update-packages --force-upgrade.

Fixes #18988.