🎉 (line) allow to disconnect lines / TAS-775

[sophiamersmann]

Resolves #2824

Allow line charts to plot indicators with markers only.

Example on staging: http://staging-site-disconnect-lines/admin/charts/8428/edit

Summary

• Adds a new flag to the display object of an indicator, plotMarkersOnlyInLineChart
• If the flag is enabled for an indicator, then the line chart only draws markers (and doesn't connect data points by a line)
• Marker-only mode for projections is not supported

I struggled to come up with a good name and in the end went with something explicit, plotMarkersOnlyInLineChart. I'm happy to rename if we come up with a better name.

I don't know why the default config action is failing, but I don't think it's related to the changes in this PR.

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This is part 1 of 3 in a stack made with GitButler:

•  3  🎉 support projections in explorers / TAS-798 #4406
•  2  🎉 support disconnecting lines in explorers / TAS-797 #4405
•  1  🎉 (line) allow to disconnect lines / TAS-775 #4382 👈

[notion-workspace]

LineChart: Allow to plot markers only

[owidbot]

Quick links (staging server):

Site Dev	Site Preview	Admin	Wizard	Docs

Login: ssh owid@staging-site-disconnect-lines

• Site-screenshots: https://github.com/owid/site-screenshots/compare/disconnect-lines
• SVG tester: https://github.com/owid/owid-grapher-svgs/compare/disconnect-lines

SVG tester:

Number of differences (default views): 0 ✅
Number of differences (all views): 0 ✅

Edited: 2025-01-13 10:07:55 UTC
Execution time: 1.18 seconds

[marcelgerber]

Oh awesome! I always wanted to have the cherry blossom chart like this, but never made the connection that a line chart is also a scatter already if it just doesn't show the line 😀