Make it fast to draw color icons

Avoid painting previous routes redundantly

Instead of using a ColorFilter, plumb the information down to Icon and thereby
to Image.

...once the animation is done.

Update dart revision

Avoid displaying too many markers when the frame time exceeds the available time by a large amount

Remove workarounds that avoided 'super' in mixins

Dart supports this properly now.

Add a flag to TextPainter to use ParagraphBuilder

This patch makes it easier to experiment with work on ParagraphBuilder.

Remove circular imports of the material.dart library

Rename App to MaterialApp

MaterialApp assumes that you're using material design.

Also move radial reaction and fix imports for stats box.

Split material design widgets out of widgets.dart

Relative paths in internal flutter libraries

These are now part of material.dart.

Now that you import a top-level file for each layer of the Flutter
framework, within the framework we can use relative paths without being
worried about the copy/pasta problem we used to have.

Mistakenly broke sky_viewer.mojo.

Introduce IO thread for background tasks

Instead of joining the UI thread to copy data from the network into a buffer,
we now drain the data pipe for image decoding on a background thread.

Currently we run some tasks on the UI thread that shouldn't block the frame,
such as decoding images. This patch introduces a background thread on which we
can run these tasks.

Have Flat buttons set their default text styles.

Also, have dialog buttons use the accent colour.
Also, generally rationalise some of this stuff to match Material better.

Adds support for keeping track of contact points in physics

Changing themes caused crash

The root cause was that we crawled the tree to mark anyone who depended
on the updated theme dirty _after_ we crawled it to rebuild it. Thus, if
anyone was already marked dirty when the process started, then got
marked clean by the first (rebuild) walk, then got marked dirty again by
the notification, they'd be clean when they got the notification,
despite already being in the dirty list, which would cause an assertion.

Also IconTheme didn't have an operator==, so it was independently too
aggressive about updates.

Add an isEmpty property to Rect

Also trace image decoding.

Defunct DismissableState should not have live animations

Drawer test.