Tooltip and hover options may be lost on update in beta 5

[joshkel]

Expected Behavior

Tooltip and hover modes should be preserved when reassigning chart options.

Current Behavior

After updating from Chart.js 3.0.0-beta.4 to beta 5, I noticed that my tooltips were no longer working. The problem appears to be the result of #7922; that PR adds logic to configure hover and tooltip options from a common set of interaction options, but that logic is only invoked on chart initialization, not on update. So, depending on how updates to the chart options are performed, the defaulted options can be lost.

(In my case, I'm using a home-grown Chart.js React component to do a wholesale replacement of the chart options object based on whatever options are passed as props to the React component.)

Possible Solution

Chart updates invoke the same interaction-merging logic as chart initialization, or tooltips and hover fall back to interaction when the options are actually used instead of merging interaction when they're initialized.

Steps to Reproduce

See https://codepen.io/joshkel/pen/VwjBwaa. Tooltips and hover work when the chart first loads, but clicking the Update button causes them to stop working.

Environment

• Chart.js version: 3.0.0-beta.5
• Browser name and version: Chrome 86.0.4240.183

[joshkel]

Thanks!