ngx-charts: Chart Tooltip does not work on touch devices

I’m submitting a …

[x] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here

Current behavior

Tap or long press on bar chart does not display a tooltip. A long press shows an unpopulated tooltip with incorrect css applied.

Expected behavior

Tap on any chart bar (or pie slice) should display tooltip.

Reproduction of the problem Go to demo page with a touch device and tap or long press on a bar.

What is the motivation / use case for changing the behavior? Users of touch devices need access to tooltips that desktop users get on hover.