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

There was a bug in the size calculation for the height of the chip label, where it would force the label to be larger than it wanted to be, causing text to not be vertically centered.

* do not add run spacing if there are no run metrics

Make the full-screen dialog text editable in gallery (#13690)

This fixes https://github.com/dart-lang/sdk/issues/32598.

We are about to begin building gen_snapshot as a multi-arch binary,
which when run as x86_64 will generate arm64 AOT output, and when run as
i386 will generate armv7 AOT output.

Currently, gen_snapshot is an x86_64 binary, so this change is
effectively preventative in nature, and is a no-op with the current
snapshotter.

* Update text_style_test

* Update template .gitignore rules

* Remove old packages rule

* Remove IDE folders from gitignore templates

* Prefer ios.tmpl/.gitignore

* Update text_form_field.dart

* Update text_form_field_test.dart

* Update text_form_field_test.dart

* Update text_form_field_test.dart

* Bump mockito to 3.0.0-alpha+3

* Type annotation

Switch to the new Matrix4.tryInvert method to avoid throwing and catching (#15771) exceptions while performing hit testing.

Fixes https://github.com/flutter/flutter/issues/16332

* always schedule first frame when creating ticker, regardless of phase or frame

* Remove explicit child nodes

* Remove semantics on no-op menu buttons

* Add a dummy action to the overflow bar

Includes:
* Add armv7 support to create_ios_framework script (#4942)
* Roll Dart to version 09e1766e6caa537e1271fbce04ebcbf8212b6569 (#4941)

This renames the chip's border attribute to 'shape' so that it is consistent with the other places where we supply a ShapeBorder.

This is a breaking change, but a very small one: the border attribute was introduced only a few months ago, and is not widely used.

* Roll engine to version be070599a30413bd203f2d77d2179220c5569c08
(includes a roll of dart to version 3e6b8717fedce5cc28a21616f4591683c211f752

Fixes https://github.com/flutter/flutter/issues/16200

Includes:
* Revert "Roll dart to 4bcf8ad411bd90da16d44ad399bf350e8423eac9" (flutter/engine#4936)
* libtxt: render fake bold text if a bold font is not available (flutter/engine#4933)
* Set FlutterTexture copyPixelBuffer return nullable (flutter/engine#4934)
* Roll dart to 4bcf8ad411bd90da16d44ad399bf350e8423eac9 (flutter/engine#4929)

This reverts commit e9d1c8e4.

* Add disable Cupertino Switch example

* keep trailing commas consistent

* fix Cupertino Switch example linter error