Fixes #9062

This will help catch when we accidentally break --dartdocs.

* Let Theme insert an IconTheme into the widget tree

* flip the order, no real reason

* Let icon theme use its own fallback

* review notes

* more review notes

Eliminate the implementation detail of which function is called to
trigger vibration on iOS, instead report the vibration constant.

Also note that not all iOS devices support haptic feedback (e.g., older
iPod touch devices).

Covers FlutterLogoDecoration.lerp()

Disabling const constructor lint for the test values pending resolution of
https://github.com/dart-lang/sdk/issues/26980

IDEA users sometimes want to create multiple Flutter modules
in the same IDEA project. See discussion:
https://github.com/flutter/flutter-intellij/issues/1014

In this case, we will actually have pairs of modules,
one for Flutter and one for Android. Renaming the
android module to make the relationship obvious.

But, don't delete the old file yet to avoid breaking
existing users. We can do that after the next
Flutter plugin release.

This will get tested once we turn on fatal errors for dartdocs.
We can't do that yet because of upstream failures.

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. :-)