Chart.js 3.0.0-rc.5: Plugins are not registered correctly if used for specific chart instances.

Expected Behavior

I expect to be able to specify a plugin for a specific chart instance without having to register it globally

Current Behavior

Plugin is not effective. Not all plugin lifecycle events seem to be called when adding a plugin to a specific chart instance.

Steps to Reproduce

https://codepen.io/santa-85/pen/BaQgqYe?editors=1111 To see correct behaviour, add chartjsPluginAnnotation to the Chart.register call

Environment

• Chart.js version: 3.0.0-rc.5
• Link to your project: https://github.com/valor-software/ng2-charts/pull/1276

[etimberg]

I added some more documentation on the plugin hooks and added some flow charts on how create/update work. There are other hooks (start/stop) that get called for all plugins on a per-chart basis when a plugin is added/removed from the chart instance.

This specific issue with the annotation plugin is because it was never written to handle being applied inline. Depending on the plugin, and what is needs to do, inline can make sense. For example, a plugin to draw the framerate of the chart animations could likely be done with no options, defaults, or registered elements so adding inline is totally fine.

[santam85]

@etimberg I started testing this only since the first rc version, but I suspect it was there for a while.