Migration guide for RouteSettings copyWith

The RouteSettings.copyWith method is removed, and apps that use it need to use the constructor to create a new RouteSettings instance instead.

With the introduction of the Page class, the RouteSettings.copyWith was no longer a viable API.

RouteSettings.copyWith was removed

Code before migration:

RouteSettings newSettings = oldSettings.copyWith(name: 'new name');

Code after migration:

RouteSettings newSettings = RouteSettings(name: 'new name', arguments: oldSettings.arguments);

Landed in version: 3.5.0-9.0.pre-137-gc6f6095acd
In stable release: 3.7

Relevant PRs:

• PR 113860: Removes RouteSetting.copyWith.

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