Fix tab fling scrolling when the last tab is selected

generate docs for sprites

Reimplement TabBarSelectionState.of() using new methods

Tabs don't display items other than 0 and 1

The TabBarView wants to remap page indices during tab transitions, which
I broke when I refactored TabBarView.

Fixes #1119

Limit the size of the image cache

Fixed #1009

Handle trying to upgrade Flutter with no upstream

Move default back behavior to FlutterWidgetBinding

Fixes #1084

Remove BlockDirection in favor of ScrollDirection

Fix Scrollable.of()

`flutter start` crashes when port 8181 is in use

We'll probably renaming ScrollDirection to Axis in a future patch.

Fixes #151

Catch the error and log a warning.

Fixes #1050

TabBarView material gallery demo

Previously MaterialApp was responsible for ending the activity when the
back stack was empty. However, this behavior is more general than
material. This patch moves the behavior to FlutterWidgetBinding, which
has a global view of all the binding observers.

Fixes #1086

Make ancestorStateOfType() and ancestorRenderObjectOfType() support
subclassing.

Fixes https://github.com/flutter/flutter/issues/1087

Rationalise all our exception catching and reporting code

- make them all have the same style
- make them all include the stack trace last
- make them all stop printing if their callback is set (if
  appropriate, they don't yet all have callbacks)

Remove unreferenced getter "debugDoesLayoutWithCallback".

I think I wanted to use this at some point but ended up going a
different direction. Instead, object.dart has a private field that
serves a similar purpose.

AnimatedContainer has an issue with one config value change and not another

Revert "Make `flutter listen` exit nicely when missing dependencies"

Make `flutter listen` exit nicely when missing dependencies

If we're already at the target value, we fail to configure the variable. If
another variable animates, we re-animate the other variable.

Fixes #958

Previously it died with a confusing exception.

@chinmaygarde

Enable more asserts when building with virtual viewports

Switch PageableList over to using RenderList

This patch moves PageableList off HomogeneousViewport and onto RenderList and
friends, making it match the new ScrollableList.

Download the Xcode artifacts for the current engine revision

have flutter logs log stderr

Teach `flutter trace stop` to use time on the device.