I took the logo_square from:
https://github.com/flutter/identity-assets/tree/master/assets/logo_square
Opened it in preview, gave it a white background
and then dropped it in the icon tool to create
these updated icons.

We may want to use offwhite like we did for Android
but this is sufficient for my demo today.

@hansmuller

We don't yet know how to do this without poping during hero animations.

Now the flexible space bar computes its effect from its size rather than from
the Scaffold's animation.

After this patch, they ignore pointers.

BUG=https://github.com/flutter/flutter/issues/3938

This patch improves the Post and Shrine transitions by making the AppBar
into a Hero and changing the default MaterialPageTransition. Now the
AppBar transitions smoothly between screens and the
MaterialPageTransition doesn't involve a fade effect.

Also, rejigger the bounds of the image header in Pesto to avoid the
"pop" at the end of the animation by laying out the image header at its
final visual size instead of relying on occlusion to size the image
header.

Fixes #5202
Fixes #5204

Why this matters: If you navigate back to a page with a Scrollable that
has a nonzero scrollOffset, we will restore that scrollOffset. We clamp
the scrollOffset to the contentExtent before the first layout, before
contentExtent is updated to its proper value. Initializing contentExtent
to INFINITY effectively disables the first clamp, until we can get a
valid value from layout. Since the previous scrollOffset was valid, it
seems safe to assume it's still valid.

BUG=https://github.com/flutter/flutter/issues/4883
BUG=https://github.com/flutter/flutter/issues/4797

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