Fixes #10077

Should be reverted when https://github.com/flutter/flutter/issues/6577
is fixed.

Adds a widgets that blocks all semantics of widgets below it in paint order within the same container (#10425)

Adds support for requesting keyboards optimised for email address and URL entry.

Fixes https://github.com/flutter/flutter/issues/10424

* Small setup doc for the app store option

* review notes

This prevents some of our mixins from being subclassed.

Also, move mixins to using 'extends' instead of 'implements' for
future compatibility with Dart changes.

Also, rename a class that had Mixin in the name but was not a mixin.

* add min version checks for IntelliJ

* validate the installed versions of IntelliJ and the flutter plugin

* review comments

* have app loggers log to their parent logger

* rename field to parent

* add todo

* revert flutter_tools.iml change

* ping the bots

Picks up accessibility fixes.

* preview of prefer_asserts_in_initializer_list lint

* fix issue

Create a CupertinoNavigationBar without automatic adding of the lead button

Extract layout logic in material app bar to a common file that can be reused for cupertino

* (Update and) Integrate Rendering README into code

* Add mising whitespace

* Review comments and other touch-ups

Fixes https://github.com/flutter/flutter/issues/10399

* move more tests to Linux hosts

* fix test

Eliminates nearly-duplicate install instructions for libimobiledevice,
ideviceinstaller.

Since ideviceinstaller depends on libimobiledevice, it's almost certain
that if libimobiledevice isn't installed, or needs updating, so does
ideviceinstaller.

This message will be emitted both when libimobiledevice requires
updating, or when it has not yet been installed.

It's also not specifically the version of Xcode that it's incompatible
with, it's the lockdownd daemon, which is actually more closely tied to
iTunes.

Check ThemeData instead of Theme.

Also, clean up the menus code a bit.

Also, make it easier to write a PopupMenuEntry that has itself many
items (for example, the way Chrome's menu has icons in a row).

Fixes https://github.com/flutter/flutter/issues/9923

The lint ensures that the prefix you use in your "import ... as"
directive conforms to lowercase_with_underscores style. However,
generated code often doesn't, since it may use preceding underscores
for collision avoidance, or directly use locale codes in the
prefixes.