[FEATURE "ember-routing-transitioning-classes”]

Disables eager URL updates during slow transitions in favor of new CSS
classes added to `link-to`s (in addition to `active` class):

- `transitioning-in`: link-to is not currently active, but will be
  when the current underway (slow) transition completes.
- `transitioning-out`: link-to is currently active, but will no longer
  be active when the current underway (slow) transition completes.
Merge pull request #9919 from machty/transitioning-classes

[FEATURE "ember-routing-transitioning-classes”]
[FEATURE] Revert ember-routing-will-change-hooks
[FEATURE] Revert ember-routing-handlebars-action-with-key-code
[FEATURE] Revert ember-runtime-item-controller-inline-class.
[FEATURE] Revert event-dispatcher-can-disable-event-manager.
[FEATURE ember-routing-transitioning-classes] namespace classes

Use .ember-transitioning-in and .ember-transitioning-out
instead of non-ember-namespaced classes.
Merge pull request #9984 from rwjblue/revert-features

Revert features that are no longer in the proper direction.
[FEATURE ember-routing-transitioning-classes] enable this feature
Merge pull request #9987 from machty/ember-transitioning-in

[FEATURE ember-routing-transitioning-classes] namespace classes
Stream-based shouldDisplay checking

Closes #9895.
Merge pull request #9988 from ef4/fix-inline-if

Stream-based shouldDisplay checking
[BUGFIX release] Fix hasThis lookup regression

Also optimizes lookup using lastIndexOf(x, 0), resulting in a constant time lookup
Merge pull request #9991 from kanongil/this-path-fix

Fix hasThis lookup regression