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Hover label order for overlapping points is backwards when using WebGL #4999
Description
In a scatter plot with overlapping points, when the hovermode is set to closest, the usual behavior is to show only the information of the trace that is the most in the foreground, that is the latest one to be added, equivalently the one with largest trace number.
example: https://plotly.com/~frseguin/3/
I have noticed that when using WebGL, the information shown is instead of the trace most in the background, equivalently the trace with the smallest number. I do not know if this behavior is intended or not, but seeing as it is different from the regular scatter plot, I thought it might be a bug.
example: https://plotly.com/~frseguin/5/
My use case is the following. I have a line plot on which I want to highlight certain points with markers, but not all of them. I am adding a markers trace for those points on top of the lines trace so that it is visible. I also want the hover info to display the info from markers. At the moment, in WebGL, I can't seem to be able to do both (Trace on top and display hover info).
Thank you very much for your help.
Activity
Plot points twice in 2D projection plots due to plotly/plotly.js#4999
Feat@atlas projection (#85)
gvwilson commentedon Jun 17, 2024
Hi - we are trying to tidy up the stale issues and PRs in Plotly's public repositories so that we can focus on things that are still important to our community. Since this one has been sitting for several years, I'm going to close it; if it is still a concern, please add a comment letting us know what recent version of our software you've checked it with so that I can reopen it and add it to our backlog. Thanks for your help - @gvwilson
aviezerl commentedon Jun 28, 2024
The issue still exists in version 4.10.4 (R package) and is still of concern when using WebGL.
Lexachoc commentedon Oct 9, 2026
I missed this earlier and opened #8077 for the same issue. It has since been fixed by #8079.