* Can show context menus anywhere in the app, not just on text.
* Unifies all desktop/mobile context menus to go through one class (ContextMenuController).
* All context menus are now just plain widgets that can be fully customized.
* Existing default context menus can be customized and reused.

Fix for text selection toolbar position in cases with overflowing text.

This reverts commit c74a646b.

* Clean up ClipboardStatusNotifier

* fix

* fix test

* more refactaaaaagit add .

* Unify Text selection API

* fix test

* further simplify

* fix more tests

* styling change

Cut now explicitly updates the clipboard status.

[TextSelectionControls] move the tap gesture callback into _TextSelectionHandlePainter, remove `_TransparentTapGestureRecognizer`. (#83639)

A very minimal right-click menu for Mac desktop.

Exposes the ability to create custom Material text selection toolbar menus, and cleans up the code around these menus.

Adds MediaQuery.maybeOf to replace calling MediaQuery.of(context, nullOk: true), and removes the nullOk parameter. Also changes MediaQuery.of to return a non-nullable value, and removes many instances of the ! operator, reducing the possible places where a null dereference could occur.

* migrate material to nullsafety

* address review comments

* address review comments

* fix build

Complete the migration to the TextSelectionTheme by deprecating the opt-in flag and text selection properties in ThemeData. (#66482)

Create a new TextSelectionTheme for text selection properties.

This reverts commit b3c237ce.

* add language version 2.8 in packages/flutter

* enable non-nullable analyzer flag

This reverts commit 8de07d55.

This reverts commit d9882263.

Unrevert of paste button hides when nothing to paste

This reverts commit d5634982.