This also required changing the AnimationController state transition
logic to signal completion of the animation during the tick that
finishes the simulation.

Fixes https://github.com/flutter/flutter/issues/3675

Fixes https://github.com/flutter/flutter/issues/5178

These examples should show the best practices for working with
AnimationControllers.

Fixes #5206

Thanks to @leafpetersen for catching these.

Adds Scheduler.debugPrintTransientCallbackRegistrationStack so that you
can find out how your current callback got registered.

* General improvoments to the loader app:
   * Show a message after 8 seconds if no connection comes in.
   * Show a progress bar as files are being uploaded.
   * Hide the spinner just before launching the application.

* General improvements to the "flutter run" UI:
   * Add "?" key as a silent alias for "h".
   * Make the help text bold so it doesn't get mixed with the logs.
   * Make "R" do a cold restart when hot reload is enabled.

* Supporting features and bug fixes:
   * Add support for string service extensions.

* Other bug fixes:
   * Expose debugDumpRenderTree() outside debug mode.
   * Logger.supportsColor was missing a getter.
   * Mention in the usage docs that --hot requires --resident.
   * Trivial style fixes.

Image listeners installed in paint handlers need to know whether the listener
is being called during the paint.

Fixes https://github.com/flutter/flutter/issues/4937

Previously we were resizing a paragraph of text during the animation. Now we
animate the text and the image separately. Also, add a default hero tag for
FloatingActionButton so that it animates as part of the hero transition as
well.

* update the color and logo for the docs site

* update the color and logo for the docs site

* remove unused file

* removed unused script code

* tweak styles for inherited names

This patch starts a semantic versioning scheme for Flutter. We're still
experimenting with semantic versioning, which means the version number
might not be reliable yet.

Also, add FractionalOffset.inscribe.

* Added custom radii to RRect.

This is the first commit towads an implementation of
MergeableMaterial. It adds custom radii to RRect.

* Renamed RRect constructors and added BorderRadius.

BorderRadius is a class similar to EdgeInsets that lets you define
all rounded corners of a rounded rectangle easily.

And make Scrollbar work with LazyBlock.

And an about box to the Stocks sample app.

Fixes https://github.com/flutter/flutter/issues/5086

BUG=https://github.com/flutter/flutter/issues/5103

These now have sorter names to make the callers less verbose.

These let you add Align widget to the inside or outside of a container.
Several customers have asked for these properties.

Fixes #4950

Some folks didn't realize these existed and asked us to add them. By
using them in examples, hopefully folks will discover them more easily.

* Adds `empty_statements` (new in `0.1.21`).
* (Re)enables `iterable_contains_unrelated_type` (fixed in linter#245).

This slipped in with an earlier commit.

- show the next error fully after a hot reload
- hide _AssertionError in stacks
- immediately rebuild after a reassemble, so that hit tests work
- catch errors when notifying global key listeners

This was a minor typo in the original code. It makes the license display
slightly cleaner.

Previously we would rebuild every route on the second animation frame to
rejigger the offstage bit and the animations. Now we build the page once and
update the offstage bit in place and update the animations using
ProxyAnimations.