On failure to configure a mock VM service, we get a useful exception in
setUpAll(). This change prevents an additional failure in tearDownAll()
that provides no additional useful diagnostic info.

Fixes the broken build in the Chromium bots

Under android/ directory, ignore:
GeneratedPluginRegistrant.java

Under ios/ directory, ignore:
GeneratedPluginRegistrant.h
GeneratedPluginRegistrant.m
Pods/

Ensure that showing the keyboard applies padding, reducing the view
height.

Under android/ directory, ignore:
GeneratedPluginRegistrant.java

Under ios/ directory, ignore:
GeneratedPluginRegistrant.h
GeneratedPluginRegistrant.m
Pods/

Fix sliver padding assertion failure that sometimes happens during startup because the app is temporarily built with zero size

* first pass

* improvements

* extract terminal.dart

* rebase

* add default terminal to context

* The analyzer wants the ../ imports in front of the ./ imports

* review notes

* Add manual test for color space rendering behavior

* Remove unneeded assets

* Add test for color demo

* Drag up to scroll down

Previously it was (arbitrarily?) set to 144.0 pixels wide.

* Remove root restriction

https://github.com/flutter/flutter/issues/9547

* Add back log msg

Instead just disable the slider.

Fixes https://github.com/flutter/flutter/issues/10055

The slider never really made much sense and it violated UX guidelines.

https://github.com/flutter/flutter/issues/4147

Previously we used logical pixels. This made the accessibility metrics
tiny on modern devices, since the OS works in physical units.

Also add a bit more debugging info and some docs.

Previously we threw an exception to require a non-null value. Now we
just treat null as the common case of not stopping propagation.

Rather than complain about these in a code review I figured I'd just fix them. :-)

Fixes #10106

For some reaosn, when we discovered our URI, we were re-instantiating
the `Completer` instance variable whose future we listen to in `nextUri()`.
This led to a race between a caller calling `nextUri()` and us discovering
the URI. If we happened to discover our URI before a caller called
`nextUri()`, then they would be left waiting on a future from the newly
allocated `Completer` (which would never complete).

Fixes #10064

Requires https://github.com/flutter/engine/pull/3688

Also:

* Make TextPainter.preferredLineHeight honour root fontSize

* Remove bogus docs.

* More aggressively track dirty state for RenderEditable.

* Some tests.

* blind wrote everything except the user prompt

* works

* Add some logical refinements

* Make certificates unique and add more instructinos

* print more info

* Add test

* use string is empty

* review notes

* some formatting around commands

* add a newline

See https://github.com/flutter/flutter/pull/10000