* Recreate outputFileName completer, handle process launch errors.

* Fix formatting

* Updated comment

* Things lay out but the effects not right yet

* Remaining functionalities and tests

* one line large title only

* Add more docs

* review

This will make it more tractable to convert them for RTL.

Adds a default title to the Title widget, fixes #6802.

* Show accessibility frame while scrolling

* ++

* fix test

Closes https://github.com/flutter/flutter/pull/12049

Update to reflect https://github.com/flutter/flutter/pull/11751 and https://github.com/flutter/website/pull/663

Diagnostics object is.

Fix a bunch of obvious RTL bugs from code inspection.

Removed the legacy --plugin option from flutter create.  Fixes #11815.

* only tap on widgets reachable by hit testing

* use FractionalOffset

* added tests

* check finder finds correct widget

* undo unintentional changes

* address comments

* style fix

* add Directionality in test

* fix analysis warning

* Refactor SemanticsData and SemanticsNode to use Diagnosticable.

* Switch toStringDeep to take named parameters.

* Make an app's supported locales configurable

* Added an supportedLocales.isNotEmpty assert

* WidgetsApp no longer const because supportedLocales.isNotEmpty

* updated per review feedback

* tweaked dartdoc to restart the build

* updated per review feedback

* Updated per review feedback

* ++

* ++

* ++

* ++

* ++

* dart docs

* test fix

* undo unintended change

* fix test

* fix test

* review feedback

...rather than only wrapping the children.

Also, improvements to Banner to better support RTL, and mock_canvas to
make debugging things easier.

Notice that the default alignment for Stack needs to know the
directionality.

* Rename BannerLocation enum values

 * topLeft -> topStart
 * topRight -> topEnd
 * bottomLeft -> bottomStart
 * bottomRight -> bottomEnd

These names will make it easier for us to adjust the location of the
banner in right-to-left mode.

See the discussion on flutter-dev.

* Add RTL support for Banner

Fixes #11905

* Selectively apply margin between middle and leading

If ToolbarLayout does not have a leading widget, we should not put a margin between leading and middle areas since it ends up being blank space that looks odd. Fixes https://github.com/flutter/flutter/issues/11963

* Fix the failing test which is a good test case for missing leading widget

This roll includes:
https://github.com/flutter/engine/pull/4069 - Return generated kernel filename on incremental compilation results
https://github.com/flutter/engine/pull/4070 - Updates for the dart:fidl.internal rename and split
https://github.com/flutter/engine/pull/4072 - Set the is_official_build flag that disables GR_TEST_UTILS in Skia
https://github.com/flutter/engine/pull/4067 - Define which SemanticsNodes are a11y focusable on Android

* Include instructions to build host configuration for preview-dart-2

* Space before lparen

This was introduced to suppress libMobileGestalt noise originating from
libsystem_asl.dylib. Commit 39680ebf
suppresses all application log messages not originating from the
app/engine iteself on iOS 10 and above. Since the log message in
question is only emitted on devices running iOS >= 10.3.0, this
blacklist no longer necessary.

On iOS 10 and above, suppress engine log messages from system components
other than Flutter. This eliminates a large amount of keyboard/plugin
related noise during edit-refresh development.