[Bug] tooltip.axisPointer.snap:true not working well with sampling: 'lttb'

[jeandet]

Version

5.4.1

Link to Minimal Reproduction

https://github.com/jeandet/JS_experiments/blob/2e81d1179781fa30f569fd818d0276d21a9b3def/eCharts/index.html

Steps to Reproduce

Just load the html file and compare tooltip while zoomed or not. Then replace sampling by 'max' for example and repeat.

Current Behavior

When zoomed out tooltip doesn't always show all series values while they have the exact same sampling time, this seems to be due to lttb resampling algorithm. Not sure why it doesn't preserve the same time for each pixel, assuming it only downsample to ~2 values per pixel.

Expected Behavior

Using lttb resampling algorithm shouldn't affect resulting points time and so tooltip should show values for all series when they share the same source sampling rate/time.

Environment

- OS:Linux
- Browser:Brave
- Framework:

Any additional comments?

The given example fetches data from a public WS.