The save action has been implemented, and it is listened to by the
canonical enabled state in the previews reducer, and by the settings
reducer to perform UI changes.
The enabled state of the application has been kept in the preview
reducer as the canonical source of truth. See supporting changes for
documentation about the decision.
Actions:
* Introduce new action SETTINGS_CHANGE with the enabled status
* Trigger that action when clicking Save in the settings dialog
Reducers:
* Listen to SETTINGS_CHANGE in the preview reducer to update enabled
status
* On the settings reducer
* Handle the SETTINGS_CHANGE action
* Add showHelp flag to determine if the help should be showing
Change listeners:
* Switch to compare past vs present changes in the implementation
* Handle showing and hiding the help
Supporting changes:
* On the rendered settings dialog:
* Change #hide to actually just hide and remove legacy if statement
* Add #toggleHelp method to show or hide the help dialog
* Add doc/adr/0003-keep-enabled-state-only-in-preview-reducer.md to
support the decision of making the saveSettings action creator return
a Redux.Thunk and keeping the enabled state just in the preview
reducer.
* Add NB to actions#saveSettings explaining and linking to the
document
Follow commits soon:
* Persist the settings change to local storage when it changes, and
unify with the preview change listener
Change-Id: I80dc5f29fbe6286f2e3e3b50d909894bc5041ccd
