TransformContext: Track moving, set dragging to false on pointer up

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Name	Status	Preview	Comments	Updated (UTC)
layerchart	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 3, 2024 11:38pm

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Latest commit: 1cce3f161fb2ed78b6d66f58d68877814050c200

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| Name | Type | | ---------- | ----- | | layerchart | Patch |

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[techniq]

Thanks @dimfeld. I experimented with using $moving and $dragging within HitCanvas to help with performance.

$dragging works well, but $moving with a spring resolves after many seconds. I tried refining precision, but it was either still too slow, or caused a lot of janky resolving (with values like 1).

https://github.com/techniq/layerchart/assets/177476/686e2f10-4251-4e16-a60d-0463ac5da612

I'm going to merge this as it's helpful to know the state, and we can always refine how it's used. For now, I'm only going to update HitCanvas to not render when dragging, which is a good win in itself.

[dimfeld]

Yeah that’s what I saw as well. I think there are other good reasons to not hide the HitCanvas when moving too, such as clicking two countries in rapid succession in the animated globe example.