[Bug] Line chart tiny segments skipped, becoming a slope

[rtub-prog]

Version

5.6.0

Link to Minimal Reproduction

https://codesandbox.io/p/sandbox/pdh82y?file=%2Findex.js

Steps to Reproduce

1. change the time on datapoint1 from 08:59:30 to 08:55:30
2. change the time on datapoint1 back
3. repeat

Current Behavior

When we have the following data:

• datapoint1=[08:59:30, 1]
• datapoint2=[09:00:00, 1]
• datapoint3=[09:00:00, 0]

With the following line chart setting:

• type:'line'
• step:'end'

The line chart ignores datapoint2 and draws a line from datapoint1 to datapoint3 which becomes a slope.

Expected Behavior

The line chart should draw the line vertically (not as a slope) from datapoint2 to datapoint3 to represent what the data is actually doing.

Environment

- OS: Windows 11
- Browser: Microsoft Edge Version 148.0.3967.54 (Official build) (64-bit)
- Framework:

Any additional comments?

The line of code that appears to be causing this behaviour is "/src/chart/line/poly.ts" at line 83. (The section for "Ignore Tiny Segment.")

            // Ignore tiny segment.
            if ((dx * dx + dy * dy) < 0.5) {
                idx += dir;
                continue;
            }

[rtub-prog]

The line is sloped when datapoint1 and datapoint2 are close (the line is drawn from datapoint1 to datapoint3:

The line is vertical as expected when there is some distance between datapoints (the line is drawn from datapoint2 to datapoint3):

[helgasoft]

confirmed - correct 90° vertical line on zoom-in becomes a slightly sloped line on zoom-out, Demo.
Looks like this was coded on purpose for some reason.