timeline history-graph: "jagged" look

[ildar170975]

Checklist

• [X] I have updated to the latest available Home Assistant version.
• [X] I have cleared the cache of my browser.
• [X] I have tried a different browser to see if it is related to my browser.
• [ ] I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Since some update a timeline history-graph is rendered like "jagged". It is especially visible with frequently changing entities:

Look at the artefacts on top & bottom parts of the timeline. Zoomed in:

Not observed if a browser's page is zoomed in:

Seems that the graph got a semi-transparent outline which causes these artefacts. Probably the outline should be opaque.

One more example:

Observed in Chrome & FF.

I believed that timeline graphs are made with Chartjs, but failed to find a "timeline" graph in their Docs.

Describe the behavior you expected

Not "jagged".

Steps to reproduce the issue

Open history graph with many short chages.

What version of Home Assistant Core has the issue?

2024.1.1

What was the last working version of Home Assistant Core?

No response

In which browser are you experiencing the issue with?

Chrome 120.0.6099.216

Which operating system are you using to run this browser?

Win10

State of relevant entities

No response

Problem-relevant frontend configuration

No response

Javascript errors shown in your browser console/inspector

No response

Additional information

No response

[ildar170975]

2024.3 - much better:

Zoomed in:

Closing.

Also:

[ildar170975]

Have no idea why - again see this jugged look:

[ildar170975]

Tested in 2023.7.1 - a normal look:

Zoomed in:

So, after some version of HA it became worse.

[github-actions[bot]]

There hasn't been any activity on this issue recently. Due to the high number of incoming GitHub notifications, we have to clean some of the old issues, as many of them have already been resolved with the latest updates. Please make sure to update to the latest Home Assistant version and check if that solves the issue. Let us know if that works for you by adding a comment 👍 This issue has now been marked as stale and will be closed if no further activity occurs. Thank you for your contributions.

[ildar170975]

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