Bar length transitions

[nicolaskruchten]

Subset of #3456 for roadmap purposes...

Bar length should support transitions either via frame-animation or react() with transitions. This includes stacked bars which should transition without gaps or overlaps.

[etpinard]

Duplicate of #1019

[etpinard]

From Ricky's #1143 (comment)

I'm hoping will get a chance to loop back to it in the next week or so. Getting it started was pretty easy, but I don't yet know all the ins and outs of bar graphs and need maybe a day or two to lock down the remaining details. barmode: 'relative' is currently the one that was causing problems, though I suspect there are a decent number of details I still need to address.

and his TODO list in #1647 (comment) had

• fix barmode: relative
• test
• object constancy for bar text

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So, it sounds like getting bars under barmode: 'relative' to animate properly will be trickiest part to ✅

[nicolaskruchten]

Heh yeah. And we changed the behaviour of group barmode since then also to look more like relative. And we added connectors ;)