* Improved update_icons.dart

* Handle _

* Update dartdoc

* Rename function

* formatting

* fix type

* Refactor ID generation

* rename

* cleanup

* update comment

* replace typedef with type

* Fix sorting

* Update icons.dart

* [Fonts] Update material icons (#78311)

* Update icons

* remove trailing blank line

* Update icons.dart

This reverts commit e34f3b01.

* Update icons

* remove trailing blank line

* Update icons using new process

* Remove trailing blank line

* regen icons.dart

* regen with new codepoints

* Update material_fonts.version

Keep current Roboto

* Update update_icons.dart

* Merge and simplify identifier rewrites

* Update update_icons.dart

* Update update_icons.dart

* Update update_icons.dart

* Add newline

* remove whitespace

* Copy instead of moving

* Fix typo

* Clean up code

Introduce fullFlutterId and fix a small dartdoc bug

* Update update_icons.dart

* Implement sorting

* Remove trailing spaces

* Revert "Remove trailing spaces"

This reverts commit c198a160678f636add30966a016383657ea76972.

* Revert "Implement sorting"

This reverts commit 0fac8c1f1c8ba1ce867f5d5205e3d6f751c08a89.

* Revert "Revert "Implement sorting""

This reverts commit 0f8ec2381ac87b44f43554d267783a5cc2375172.

* Revert "Revert "Remove trailing spaces""

This reverts commit c3ef8658799e4f7aab851ff830d62ca2bb9aba94.

* xx

* add braces

* Update update_icons.dart

* Merge and simplify identifier rewrites

* Update update_icons.dart

* Update update_icons.dart

* Update update_icons.dart

* Add newline

* remove whitespace

* Copy instead of moving

* Fix typo

* Clean up code

Introduce fullFlutterId and fix a small dartdoc bug

* Update update_icons.dart

* Implement sorting

* Remove trailing spaces

* Revert "Remove trailing spaces"

This reverts commit c198a160678f636add30966a016383657ea76972.

* Revert "Implement sorting"

This reverts commit 0fac8c1f1c8ba1ce867f5d5205e3d6f751c08a89.

* Remove trailing space

* Add bug number

* Rename 2d rewrite

* Add _replaceLast

* Add comment

* Simplify, remove fullFlutterId

* Remove IconStyle and reorder

* xx

* reorder

* refactor update_icons

* fix trailing space

* address feedback

* add platform adaptive icons

* fix merge conflict

* Update dartdoc

* Address feedback

* Specify types

* Add tests

* fix indentation

* Remove trailing space

* Remove isCupertino static bool

* [Docs] [Icons] Updating dart doc styles to recognize more styles of icons. All the 4 icon styles we support have to be pulled from 4 individual web fonts when we show the html page for api docs.

* Better documentation and that special awful case.

* Couple more places to remove.

* add language version 2.8 in packages/flutter

* enable non-nullable analyzer flag

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

* Remove workaround for dart-lang/dartdoc#1125

* Update update_icons.dart for optional const and to remove markup stripping workaround

It was causing problems rolling Flutter into Fuchsia

* re-enable lint unnecessary_const

* remove trailling whitespaces

* remove unnecessary const (after merge)

This reverts commit cc1cf13e.

Previously, ExpansionPanel would do weird things if interacted with
when it was already animating. This is fixed and there's now a test.

Also:

 * Minor fixes to make the gallery work in RTL, not that there's
   any way to see that without hard-coding the framework to RTL.
   But at least I'll be less annoyed when doing that.

 * Some trivial code and documentation cleanup.

I'm not really sure how to test this without a reference test, since
eventually we want to move this to a font feature and thus the obvious
test (looking for the Transform widget) isn't really valid.

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

Turns out we have many immutable classes.

Fixes #6892

This update adds support for custom fonts in icons. As an example, it
can be used with the icon-set from https://materialdesignicons.com

Thanks to @vlidholt for the original patch.

Fixes #4494
Fixes #3199