Fix the spelling errors in the dartdocs for the framework.

There are no functionality changes here, just documentation fixes.

Integrate Strut: Add StrutStyle, expose Strut API, wire up strut with dart:ui, Roll engine 31a7f4d..e7eb1c8 (7 commits) (#26332)

Includes a breaking change to dart:ui ParagraphStyle where lineHeight is renamed to height for consistency with TextStyle.

All embedders of Flutter within Google have all been updated to an
engine version that includes the const constructor added in
flutter/engine#7346 and rolled into the framework in
flutter/flutter#26252.

This reverts commit 88b77a7d.

This fixes https://github.com/flutter/flutter/issues/26390.

Usages of ParagraphConstraints (from dart:ui) whose constructor could be
const as of flutter/engine#7346 are currently marked //
ignore:prefer_const_constructors in the framework until all
Google-internal embedders have been updated to an engine version that
includes the above change. These were initially updated in engine roll
flutter/flutter#26252, but broke internal embedders.

We should re-enable use of the const constructor in those cases once
internal embedders are updated.

See: https://github.com/flutter/flutter/issues/26390

https://github.com/flutter/engine/compare/7112b72cc229...e5ec3cf3ea5c

git log
7112b72cc229e05d36716c3d7739885d3ffa72e6..e5ec3cf3ea5ce78c6c3116271601f60d30a799d4
--no-merges --oneline
e5ec3cf3e Dart SDK roll for 2019-01-08
08c95d27a Roll src/third_party/skia 55ff5d3ba881..1337f5b85978 (10
commits) (flutter/engine#7407)
e385f5cbb Roll src/third_party/skia 26d173fee72b..55ff5d3ba881 (12
commits) (flutter/engine#7406)
0f8273b0c Dart SDK roll for 2019-01-07
4036b260a Reset ParagraphBuilder after build() (flutter/engine#7401)
4820cbec4 Dart SDK roll for 2019-01-07
8eccb860d Add onStart hook to FlutterFragmentActivity
(flutter/engine#6719)
f2ea838b3 Roll src/third_party/skia b2fdcbf3033f..26d173fee72b (10
commits) (flutter/engine#7400)
5ca8aadaa Announce in/out of list (flutter/engine#6918)
4487d392d Replace Java code with equivalent, more concise code.
(flutter/engine#7398)
395b7852d Roll src/third_party/skia 46ee3f7a8ff5..b2fdcbf3033f (11
commits) (flutter/engine#7394)
5965f9084 Make `ParagraphConstraints` have const constructor
(flutter/engine#7346)
e02dd416a Roll src/third_party/skia a47eb455360f..46ee3f7a8ff5 (2
commits) (flutter/engine#7390)
f0038b3cc Roll src/third_party/skia 3ac3a4053f86..a47eb455360f (2
commits) (flutter/engine#7389)

* Fix bug in calculation of downstream text distance when aligned: right

* After having affinity explained to me, match getOffset and tests to
expected behavior

* Clean up test formatting and fix analyze errors

* Improve test comments and reorganize a bit

* Specify logical pixels

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests

Use a space instead of a zero-width space to calculate the preferred height of a line of text (#16972)

The zero-width space character may not be supported by the font requested in
the text style.  If that happens, then libtxt will fall back to another font
to render that character, resulting in text metrics that do not match the
intended font.

Fixes https://github.com/flutter/flutter/issues/16257

See https://github.com/flutter/flutter/issues/12630 and
https://github.com/flutter/flutter/issues/16408

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.

I got tired of drive-by spelling fixes, so I figured I'd just take care of them all at once.

This only corrects errors in the dartdocs, not regular comments, and I skipped any sample code in the dartdocs. It doesn't touch any identifiers in the dartdocs either. No code changes, just comments.

Revert "Revert "Fixes InputDecorator to work with textScaleFactor, fixes Material Design differences. (#12595)" (#12678)" (#12689)

This reverts commit 72dc7d91.

Re-landing my InputDecorator changes so that I can land the character counter PR.

Revert "Fixes InputDecorator to work with textScaleFactor, fixes Material Design differences. (#12595)" (#12678)

This reverts commit 67cf7918.

Reverting because this causes scuba regressions that I'd like to
address in another PR that is pending, but we'd like to roll Flutter.

Fixes InputDecorator to work with textScaleFactor, fixes Material Design differences.

There were a number of differences with the Material Design spec, including
several different padding values and underline thickness.  This corrects
that so that the decorator is in line with the Material Design spec now.

Also, the decorator properly handles changes to the textScaleFactor, where
before it would not re-layout when needed, painting the cursor and
underline incorrectly.

The decorator also now properly animates helper, error, and hint text when
the textScaleFactor or input decoration properties change.

Helper text is now properly displayed in dense mode, as the spec shows.
Before this change, it was never displayed in dense mode.

Fixes #12485

Also:

* Make TextPainter.preferredLineHeight honour root fontSize

* Remove bogus docs.

* More aggressively track dirty state for RenderEditable.

* Some tests.

Also, fix an issue where hint text wasn't visible when the
InputDecoration was collapsed.

Fixes #8541

This patch prepares us to remove InputValue in favor of TextEditingValue.

Covers lib/ in package:flutter.

Answers http://stackoverflow.com/questions/41371449/how-do-you-use-a-textpainter-to-draw-text