(some PDF viewers) Orca using plotly.js > 1.49.5 creates thin lines for bars with 0 length

0-length bars are visible in pdfs generated by Orca even though they aren’t visible in the plotly.js graphs.

I can reproduce this issue using orca directly using this method with the below json figure.

{"data": [{"y": ["This", "is", "a", "test", "placeholder"], "x": [12, 9, 15, 12, 0], "type": "bar", "orientation": "h"}], "layout": {"xaxis": {"type": "categorical", "showgrid": false, "zeroline": false}, "yaxis": {"title": "test", "zeroline": false}}}

[antoinerg]

Thanks @michaelbabyn for the clear description of the issue and the Codepen to reproduce the issue! Thanks @archmoj for the references!

The reason why plotly.js puts a bar with a width of 0 is to properly support transitions. We can’t transition a bar from being non-existent to having a finite value. Anyway, that’s the conclusion I reached when introducing https://github.com/plotly/plotly.js/pull/4180.

It looks like a Chromium bug to me that rectangles with zero width would appear in its PDF output. Anyway, I think we could and should fix this in plotly.js since it will affect any Chromium user printing web pages and not just Orca users.

[michaelbabyn]

Note that I can reproduce the issue by printing the page to PDF using chrome if that makes debugging easier