This patch tweaks the definition of max intrinsic size to give implementations
more wiggle room to compute there intrinsic sizes more efficiently.
Specifically, implementations can now ignore the incomming constraint in the
cross axis if they prefer.

This patch removes an assert that is no longer valid w.r.t. the new definition
of intrinsic sizing.

Fixes #2099

More dartdoc for routes.dart

Assert binding ready before getting a11y listener

This adds an assert to verify that we have already got a binding when we
get a semantics listener. Otherwise we crash. (I mean, we still crash,
but now in checked mode we crash on an assert instead. Progress?)

Added support for Dismissable leave-behind list items

remove the _embedder.yaml file

implement --watch for flutter analyze

Cleanup around viewports

Cleanup build

Improve message when target not found

SizeObserver crusade: Remove SizeObserver

https://github.com/flutter/flutter/issues/2368

Include more details in the Red Box of Doom

Synchronizes dartdoc with dart:ui

Mostly just adds some examples to match the examples with use for
similar concepts in dart:ui.

Remove the second argument to WidgetError.

Remove the second argument to MultiChildLayoutDelegate.performLayout()

Fixes https://github.com/flutter/flutter/issues/2403

I have an e-mail ready to send to flutter-dev about this.

This makes WidgetError more like RenderingError, which will aid with https://github.com/flutter/flutter/issues/2356.

Fixes https://github.com/flutter/flutter/issues/2443

Factor out non-Material parts of MaterialApp into WidgetsApp

Remove Simulatable and restyle simulation_group.dart

Clarify the assert when mimicking twice in a row.

Fixes https://github.com/flutter/flutter/issues/1346

Try to clarify that you need a Material for an IconButton.

Flinging continuously should have one scroll start/end pair

Previously we got confused and started sending start/end pairs for each tick of
the fling animation.

Fixes #2430

Some more dartdoc

Fixes https://github.com/flutter/flutter/issues/2369

Clarify the "needs an Overlay" assert.