This still leaves Flex and FlexDirection available. At some point once
people have transitioned to Row/Column we should rename Flex to _Flex
and stop reexporting FlexDirection from basic.dart.
SnackBar's crash if you fail to provide a showing bool.
I tried to edit it in the framework, but this seemed easier for now.
The snackbar still shows behind the keyboard unfortunately.
https://github.com/domokit/sky_engine/issues/810
@collinjackson
Now it wont crash on save, but it still doesn't display
the error message in a snackbar and this also doesn't
wire up the enter/go key to actually do anything.
We'll need to implement performEditorAction on our
InputConnection implementation to catch this key and
pass it along to dart.
Our Input control needs to get more powerful to handle things
like this, including filtering of input.
The code was crashing by triggering a bug in the SnackBar
which didn't assert for actions, but crashed when they
were not null.
Partial fix for https://github.com/domokit/sky_engine/issues/543
@abarth
