commit b51c8114decc96bb2965035d03701198ea4d26f1
author Todd Volkert <tvolkert@users.noreply.github.com> Mon May 20 17:40:03 2019 -0700
committer dart-luci-ci-builder <dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com> Mon May 20 17:53:57 2019 -0700
tree 4c5bec798647383b406a7e411d2fabeba8dd47cf
parent 5b63939f654efba229a6a8f90c80c1ca08906686

Add some sanity to the ImageStream listener API (#32936)

The current API was broken in that you registered multiple
callbacks at once, but when you removed listeners, only the
primary listener was used to determine what was removed.
This led to unintuitive cases where the caller could get
unexpected behavior.

This updates the API to add and remove listeners using
a newly introduced [ImageStreamListener] object, a value
object that has references to the individual callbacks
that may fire.

flutter/flutter#24722
flutter/flutter#32374
flutter/flutter#32935
https://dart.googlesource.com/external/github.com/flutter/flutter/+/592f81e7c4eb31327b3cbf1e73d547587d6f7dea