* reland "Refactors global key duplication detection (#46183)"

This reverts commit d2b66dbf.

* fix test

This reverts commit 46ccd086.

This reverts commit 340b193f.

This PR fixes #49647 by changing DiagnosticableMixin.toDiagnosticsNode and other things to accept DiagnosticableMixin instead of requiring Diagnosticable.

Fixes #46150 by catching both the delete and backspace keys, rather than just the delete key.

Fixes the focus handling when popping pages so that when multiple pages are popped, the focus doesn't try to focus the interstitial pages.

Navigator 2.0: Refactor the imperative api to continue working in the new navigation system (#44930)

[a11y] Re-land Make sure RenderFractionalTranslation updates its semantics after the translation field is set (#49708)

Re-land Make sure RenderFractionalTranslation updates its semantics after the translation field is set

Added a new script to generate missing localizations for use when adding new localizations to the Flutter framework.