David Taylor f20db92512
UX: Improve loading-slider behavior (#29995)
- Use `requestAnimationFrame` when transitioning from `ready` -> `loading`. The previous `next()` implementation was unreliable, particularly in Safari, and would cause the loading slider to jump backwards instead of forwards

- Double the minimum transition time to 200ms. This avoids the rolling average being skewed too much by routes which load quickly without network access.
2024-11-29 16:32:59 +00:00
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