Plugin event filters receive normalized event type and fail when normalization occurs

[kurkle]

Discussed in #9580

^{Originally posted by beibean August 25, 2021}
Hi there,

I am using a touchscreen on a embedded device and after migrating from v2.9.4 to v3.5.1 I am not able to show tooltip as used to show it before.

I only need to show tooltip when user touches any part of the graph. We detect touches with pointerdown and pointerup events. After the library upgrade only the point is hover but the tooltip won't show:

Here is a project to reproduce it.

Any new configuration I overlooked or any suggestion to fix this?

Description

This originates from #8876

The event type is changed here:

Chart.js/src/platform/platform.dom.js

Line 106 in fca0309

const type = EVENT_TYPES[event.type] || event.type;

Original types are used to filter and it does not match.

This can be worked around by adding the normalized events: events: ['mousedown', 'mouseup'] to options.plugins.tooltip

[kurkle]

Testing this needs a fix to test-utils: chartjs/chartjs-test-utils#14