[ Widget Preview ] Invalidate scaffold project if SDK changes and regenerate pubspec on change #163343
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… code `flutter widget-preview start` will now look for functions annotated with `@Preview()` within the developer's project. These functions will be used to generate `.dart_tool/widget_preview_scaffold/lib/generated_preview.dart`, which inserts the returned value from each preview function into a `List<WidgetPreview>` returned from a `previews()` method that is invoked by the widget preview scaffold root.
…preview scaffold This also wires up the preview detector to trigger hot reloads when new previews are detected or previews are removed. Note: while this change results in lib/generated_preview.dart being generated and updated, it's not currently referenced by lib/main.dart and the preview environment will render a black screen.
… preview rendering With this change, `flutter widget-preview start` will launch a working widget preview environment that can render previews from a target project. Also fixes an issue where `--offline` wasn't being respected by some pub operations.
…enerated pubspec on change
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If the Flutter SDK is updated we need to invalidate the widget preview scaffold project to, at the very least, rebuild the precompiled application. Similarly, if the root project's
pubspec.yamlis updated, the scaffold project's pubspec should be regenerated.This change adds a
preview_manifest.jsonto the scaffold project which contains information related to:This information is used to determine whether or not the scaffold project needs to be regenerated or the scaffold pubspec needs to be updated to reflect changes to the root project's pubspec since the previewer was last run.