Legacy multiple annotations

[kidGodzilla]

Fix or Enhancement?

Resolves #909 – Multiple instances of a chart cannot be rendered at once if using the Annotations plugin

Extends the _chartRef object to handle multiple instances of vue-chartjs wrapper components, in Vue 2, when the annotations plugin is present. Assigns a unique, random ID to each one.

Sandboxes

Reproduces the issue with annotation plugin (multiple instances): https://codesandbox.io/s/practical-bas-2irrtp

Fixes the issue with updated compiled vue-chartjs legacy component: https://codesandbox.io/s/twilight-feather-ymgud6

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Feel free to suggest improvements. I believe most of #818 could be factored out to treat this state management the same, even when the annotations plugin is not present, removing the computed property & $data._chart.

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• [x] All tests passed

Environment

• OS: macOS Monterey
• NPM Version: 8.10.0

[kidGodzilla]

CI Test failures seem unrelated to my changes

[dangreen]

@kidGodzilla Hi. Thank you for the PR!

Please pull changes from main to fix CI.