This allows other code to get the same style without having to know exactly it is computed.

This attempts to apply some of what we learnt from UX studies, namely
that people wonder how to add multiple children to widget that take
one child.

Prevent header from thinking it can wrap and then overflowing.

Fix default footer string which lost its colon (localized values are fine).

Make the "rows per page" drop-down include at least one value even when the table lacks many items. (Previously it would assert if your table was too short.)

Make the footer scrollable.

Fix some todos and improve some debug output.

Tests for much of the above.

Unlike FractionalOffset, Alignment uses the center as the zero of the
coordinate system, which makes the RTL math work out much cleaner.

Also, make FractionalOffset into a subclass of Alignment so that clients
can continue to use FractionalOffset.

Just some very minor tweaks to remove subtle LTR bias.

We use the same arrow rotation animation in RTL and LTR, but I think
that's correct. Usually, rotations are either clockwise or
anitclockwise, which are the same in RTL and LTR. We might need to check
with someone who reads an RTL language to confirm.

Fixes #11845

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

Fixes #12009

Fix a bunch of obvious RTL bugs from code inspection.

when describing non-nullable method arguments.

Moved everything icons related except the material icon button and the materialicon font list to widget

* enable always_require_non_null_named_parameters lint

* Update home.dart

Also fixes a small typo.

backgroundColor -> color
backgroundImage -> image
BackgroundImage -> DecorationImage

* make @immutable const

* fix build

Turns out we have many immutable classes.

Fixes #6892

I can't figure out if this is genius or a giant hack.

This lets you use DefaultTextStyle.merge and IconTheme.merge without
specifying a BuildContext. It automatically merges in at the
appropriate place in the tree using a Builder widget.

Rename State.config to State.widget
Rename State.didUpdateConfig to State.didUpdateWidget
Renamed all State subclasses' local variables named config to something else

Aggressively apply the const lint.

* add @required when there's an assert not null

* address review comments

Covers lib/ in package:flutter.

Also use the word "dropdown" consistently over "drop down".

This patch adds a basic test for the DataTable widget.

This patch replaces uses of Flexible with Expanded where we're using
FlexFit.tight. We still need to think of a better name for the
FlexFit.loose variant.

Also, improve the docs for Row, Column, Flex, and RenderFlex to be more
problem-oriented and to give a complete account of the layout algorithn.

Fixes #6960
Fixes #5169

To match the Align widget (and several other widgets).

Fixes #6101

This requires all AnimationController objects to be given a
TickerProvider, a class that can create the Ticker.

It also provides some nice mixins for people who want to have their
State provide a TickerProvider. And a schedulerTickerProvider for those
cases where you just want to see your battery burn.

Also, we now enforce destruction order for elements.

Fixes #3208.

Fixes #5393.

These let you add Align widget to the inside or outside of a container.
Several customers have asked for these properties.

Fixes #4950

Anywhere that accepted IconData now accepts either an Icon or an
ImageIcon.

Places that used to take an IconData in an `icon` argument, notably
IconButton and DrawerItem, now take a Widget in that slot. You can wrap
the value that used to be passed in in an Icon constructor to get the
same result.

Icon itself now takes the icon as a positional argument, for brevity.

ThemeData now has an iconTheme as well as a primaryIconTheme, the same
way it has had a textTheme and primaryTextTheme for a while.

IconTheme.of() always returns a value now (though that value itself may
have nulls in it). It defaults to the ThemeData.iconTheme.

IconThemeData.fallback() is a new method that returns an icon theme data
structure with all fields filled in.

IconTheme.merge() is a new constructor that takes a context and creates
a widget that mixes in the new values with the inherited values.

Most places that introduced an IconTheme widget now use IconTheme.merge.

IconThemeData.merge and IconThemeData.copyWith act in a way analogous to
the similarly-named members of TextStyle.

ImageIcon is introduced. It acts like Icon but takes an ImageProvider
instead of an IconData.

Also: Fix the analyzer to actually check the stocks app.

This patch starts working through the missing dartdocs in widgets.dart.