* Added support for surfaceTintColor and shadowColor to the Dialog widgets.
* Updated the defaults for Material.shadowColor and Material.surfaceTint to allow turning off the features with a transparent color.
* Added support for shadowColor and surfaceTintColor for Drawer widget.

* Add clipBehavior to Card+InkWell example

* Add test for example

* Update comment

* Hide the debug banner in the PopupMenuButton example

* Add test to verify that debug banner is not shown

This reverts commit 180566f2.

* use `flutter_lints` for sample code

* update packages

* Revert "update packages"

This reverts commit 14da3c69a8da9a093ad9c2acd3fc5d6c7f7751ed.

* revert

* `Switch`: Add an interactive examples

* Update docs

* Update doc

* Replace references to LinearProgressIndicator in CircularProgressIndicator example

* Add test

* fix copyright header

`DropdownButton`: Update `selectedItemBuilder` example to show case item alignment and update DropdownButton examples (#102748)

`Tooltip`: Add an example for `TooltipTriggerMode.manual` and add tests for existing `Tooltip` examples (#100554)

This extracts the examples that are in flutter/engine@main/lib/ui/text.dart into examples in the examples/api/lib/ui directory and adds some simple tests for them.

Also, fixes some inconsistent test file naming.

This is step 1: the next step is to remove the examples from the dart:ui code.