* Allows excerpts to come from any package, not just examples.
* Fixes a bug in the excerpting logic that was causing a stray `}` to appear in one example.
* Removes the need for `build.excerpt.yaml` files.
* Remove the dependency on build_runner for excerpts.
* Reduces the time to generate the excerpts from about 10 minutes to about 5 seconds.
* Almost certainly fixes https://github.com/flutter/flutter/issues/107180 (untested).
The new logic is not quite backwards compatible; the `path-base` feature now specifies a real path to the actual source directories, rather than a path into the invisible generated `excerpts/` directory with its special structure. Also, a number of features from the previous package that were not actually used in this repository are no longer supported (such as having multiple section names per `#docregion` pragma).
This option had been disabled to match flutter/flutter, but the reason it was disabled there was "too many false positives", mostly around animation. That doesn't apply to most packages here, and we've had a number of production bugsâespecially in plugins, that use async heavily in ways that are intended to be client-awaitableâthat this would have caught.
This PR:
- Enables the option at the repo level.
- Permanently (unless the owners decide to change it) opts out `animations` and `go_router`, both of which looked like mostly or entirely false positives.
- Temporarily opted out a few plugins that have a lot of violations that should be handled in their own PRs later (`camera_android_camerax`, most of `webview_flutter`).
- Fixes all remaining violations.
In many cases this PR is behavior-changing, replacing implicitly unawaited futures that did not seem obviously intentional with `await`ed futures, so non-test code in particular should be reviewed carefully to make sure the changes are correct. All of the changes are manual, not `fix`-generated.
Part of https://github.com/flutter/flutter/issues/127323
