This widget makes it easier to animated Positioned widgets with
awareness of the ambient Directionality.

Fixes #11998

Previously, the rows and columns arguments had different semantics. Now
they have the same semantics. The new API also uses Iterable rather than
List to give clients more flexiblity in how they construct these
arguments. For example, RenderTable no longer needs to reify the
reversed list of column positions.

Also, fix asserts in TableBorder#paint to match documentation.

Fixes #12009

After all my recent refactorings, some of the names were not really reasonable any more.

* internationalize time numerals

* tests

* use foundation.dart instead of meta.dart

* address comments

* Pin all dependencies ONCE AND FOR ALL

This replaces the secret `flutter update-packages --upgrade` with a destructive `flutter update-packages --force-upgrade` that actually goes and pins every dependency and transitive dependency in every flutter package to the same version.

* Add comments.

* introduce localized text geometry in MaterialLocalizations

* remove geometry from color text themes

* fix merge conflict

* optional Localizations

* fix fallback; test; docs

* misc .arb fixes; localizations validator

* regenerate localizations

* address comments

* do not treat plural variations as invalid keys

This is the last class other than BoxDecoration in this file, so by
extracting it we finally have all the parts of BoxDecoration
extracted.

This reverts commit 4a04de5e.

* Fix inherited widget notifications in Localizations

* address comments

* Revert "Pin args to 0.13.7 to avoid version conflict (#12208)"

This reverts commit 63802b3d.

* Revert "LinearGradient and RadialGradient RTL (#12204)"

This reverts commit daedbc84.

To make it cleaner when we RTLify these.

* Refactor CupertinoScaffold

* Rename rootTabPageBuilder to tabBuilder

* fix tab transparency padding

* add a CupertinoTab

* Add default background color

* Add a bunch of examples

* A bunch of tests

* Refactor CupertinoScaffold

* Rename rootTabPageBuilder to tabBuilder

* fix tab transparency padding

* Add default background color

* review notes

* fix test

* review

* Rename CupertinoTab to CupertinoTabView

* remove final ; in sample code for analyzer

* Refactor CupertinoScaffold

* Rename rootTabPageBuilder to tabBuilder

* fix tab transparency padding

* Add default background color

* review notes

* fix test

* round 3

* partially address comments

* merge

* review notes

* review

* review

* review

* round 2

* deal with null futures

* review

* review

* review

* review

I inflated instead of deflating. Oops.

Correctly handle the case where the TextEditingController associated
with a TextField is set to null. Due to a typo (= vs ==), previously
this was a no-op and the existing TextEditingController was retained,
rather than copied.

* Add IconThemeData adjustment to ListTile trailing element (makes consistent with leading element)

* Add test for ListTile theme changes

* Pull out and share IconThemeData variable between leading and trailing

* remove extra comma

* fix style nit

Add an RTL version of BorderRadius.
Minor fixes to EdgeInsets to match.

* Record original pointer event timestamp

* review

* review

* review

* Matched motions with iOS. Didn’t add overscroll spring clamps and fix tests yet.

* clamp max overscroll transfer

* Add test

* review notes, moved things around

* remove function passing indirection

* review

* Replace stopwatch with timestamp from #11988

* move static

* Review

* Record original pointer event timestamp

* review

* review

* review