We have these details objects for the same reason we now have drag details
objects: future extensibility.

Fixes #4421

Also:
* Make PaginatedDataTable able to scroll itself horizontally.
* Make drop down buttons support having an explicit text style and icon
  size given.
* Fix a bug with drop-down buttons asserting when opened partly
  off-screen.
* Make sure to pop the drop-down button's route if the drop-down button
  is discarded while the route is up.
* Remove extraneous padding on drop-down buttons. (Couldn't figure out
  why it was there, and it breaks alignment when a drop-down is mixed
  with other text.)
* Some docs improvements.
* Add Route.isActive
* Add a setState() method to ModalRoutes.

I was also going to implement sorting and emptying the cart but the
current data model doesn't make that easy, so I gave up on that. That's
why the TODOs are moved around though.

Fix adding child views to container after changes to dart bindings.

@abarth

Fixes 3544

We were trying to unregister the pointer route twice. Now we only unregister it
once.

Fixes #4341

This lets you build something other than `lib/main.dart`.

* refactor the --resident run option into a separate file

* update daemon to run --resident apps

* re-plumbing daemon start

* send app logs

* update tests

* review changes

* fix test runner

* remove PackageMap.createGlobalInstance; rely on the ctor

* review comments

It's no longer part of the gallery app.

BUG=https://github.com/flutter/flutter/issues/4390

This fix isn't completely statisfying because it has a scaling limit. The ideal
fix would actually viewport the tiles in the grid. However, this fix is much
easier at the moment.

Fixes #4395

Now that there's a new string_scanner in town, we're having dependency
resolution conflict because of flutter_markdown's tight dependency. This
patch loosens the dependency and resolves the conflict.

BUG=https://github.com/flutter/flutter/issues/4321
BUG=https://github.com/flutter/flutter/issues/4349

This patch exposes a convenience function on Scrollable that helps with
updating the scroll extents and ports several clients over to using it.

Assigning to `size` called our intrinsic sizing functions re-entrantly, which
is a destructive operation on TextPainter. Ideally we'd made that a
non-destructive operation, but in the meantime we can fix the tab fading issue
by grabbing the text size before assigning to `size`.

Fixes #4365

The `flutter.buildMode` property now controls whether to build in debug,
profiling, or release.

Fix flutter analyze defaults when files are specified (#4091).

Also, add more dartdoc to widgets.dart.

Turns out we have the same demo in the "Buttons" section now.
We don't need both.

This patch sets a default path for Flutter.framework that's sensible based on
the FLUTTER_MODE.

The hello_services example can now be built both for Android and iOS.

* Pesto demo for the Flutter Gallery app.

* pesto.special.case

Add a FLUTTER_MODE variable to the generated Xcconfig and fix snapshot generation on all targets. (#4362)

Get rid of the DART_EXPERIMENTAL_INTERPRETER_FLAG.

This patch adds some sensible defaults to xcode_backend.sh and documents how to
build hello_services for iOS using Xcode.

I changed the behavior late in the code review but didn't update this dartdoc.

Disables current package and current directory analysis when files are specified.

Fixes: https://github.com/flutter/flutter/issues/4091.

Update Dart SDK to 1.17.0-dev.6.2.

Latest RC.

Fixes two release blockers (https://github.com/dart-lang/sdk/issues/26558 and https://github.com/dart-lang/sdk/issues/26596); bonus points for letting us re-enable the `iterable_contains_unrelated_type` lint :).